Either don't fail or retry publishing checks results

[timja]

Saw today:

[2021-10-07T11:29:57.037Z] Could not fetch revision from repository: org.jenkinsci.plugins.github_branch_source.GitHubSCMNavigator::https://api.github.com::HMCTS::document-management-store-app and branch: PR-1138

java.lang.IllegalStateException: Could not fetch revision from repository: org.jenkinsci.plugins.github_branch_source.GitHubSCMNavigator::https://api.github.com::HMCTS::document-management-store-app and branch: PR-1138

While publishing to GitHub checks

Full stacktrace:

12:29:59  hudson.remoting.ProxyException: java.io.FileNotFoundException: https://api.github.com/repos/hmcts/document-management-store-app/pulls/1138
12:29:59  	at org.kohsuke.github.extras.okhttp3.ObsoleteUrlFactory$OkHttpURLConnection.getInputStream(ObsoleteUrlFactory.java:490)
12:29:59  	at org.kohsuke.github.extras.okhttp3.ObsoleteUrlFactory$DelegatingHttpsURLConnection.getInputStream(ObsoleteUrlFactory.java:1204)
12:29:59  	at org.kohsuke.github.GitHubHttpUrlConnectionClient$HttpURLConnectionResponseInfo.bodyStream(GitHubHttpUrlConnectionClient.java:196)
12:29:59  	at org.kohsuke.github.GitHubResponse$ResponseInfo.getBodyAsString(GitHubResponse.java:314)
12:29:59  	at org.kohsuke.github.GitHubResponse.parseBody(GitHubResponse.java:92)
12:29:59  	at org.kohsuke.github.Requester.lambda$fetch$1(Requester.java:76)
12:29:59  	at org.kohsuke.github.GitHubClient.createResponse(GitHubClient.java:455)
12:29:59  	at org.kohsuke.github.GitHubClient.sendRequest(GitHubClient.java:406)
12:29:59  Caused: hudson.remoting.ProxyException: org.kohsuke.github.GHFileNotFoundException: https://api.github.com/repos/hmcts/document-management-store-app/pulls/1138 {"message":"Not Found","documentation_url":"https://docs.github.com/rest/reference/pulls#get-a-pull-request"}
12:29:59  	at org.kohsuke.github.GitHubClient.interpretApiError(GitHubClient.java:486)
12:29:59  	at org.kohsuke.github.GitHubClient.sendRequest(GitHubClient.java:414)
12:29:59  	at org.kohsuke.github.GitHubClient.sendRequest(GitHubClient.java:358)
12:29:59  	at org.kohsuke.github.Requester.fetch(Requester.java:76)
12:29:59  	at org.kohsuke.github.GHRepository.getPullRequest(GHRepository.java:1406)
12:29:59  	at org.jenkinsci.plugins.github_branch_source.GitHubSCMSource.retrieve(GitHubSCMSource.java:1626)
12:29:59  	at jenkins.scm.api.SCMSource.fetch(SCMSource.java:582)
12:29:59  	at io.jenkins.plugins.checks.github.SCMFacade.findRevision(SCMFacade.java:156)
12:29:59  Caused: hudson.remoting.ProxyException: java.lang.IllegalStateException: Could not fetch revision from repository: org.jenkinsci.plugins.github_branch_source.GitHubSCMNavigator::https://api.github.com::HMCTS::document-management-store-app and branch: PR-1138
12:29:59  	at io.jenkins.plugins.checks.github.SCMFacade.findRevision(SCMFacade.java:159)
12:29:59  	at io.jenkins.plugins.checks.github.GitHubSCMSourceChecksContext.resolveHeadSha(GitHubSCMSourceChecksContext.java:131)
12:29:59  	at io.jenkins.plugins.checks.github.GitHubSCMSourceChecksContext.<init>(GitHubSCMSourceChecksContext.java:46)
12:29:59  	at io.jenkins.plugins.checks.github.GitHubSCMSourceChecksContext.fromRun(GitHubSCMSourceChecksContext.java:24)
12:29:59  	at io.jenkins.plugins.checks.github.GitHubChecksPublisherFactory.createPublisher(GitHubChecksPublisherFactory.java:42)
12:29:59  	at io.jenkins.plugins.checks.api.ChecksPublisherFactory.lambda$fromRun$0(ChecksPublisherFactory.java:89)
12:29:59  	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
12:29:59  	at java.base/java.util.Spliterators$IteratorSpliterator.tryAdvance(Spliterators.java:1812)
12:29:59  	at java.base/java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:127)
12:29:59  	at java.base/java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:502)
12:29:59  	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:488)
12:29:59  	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
12:29:59  	at java.base/java.util.stream.FindOps$FindOp.evaluateSequential(FindOps.java:150)
12:29:59  	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
12:29:59  	at java.base/java.util.stream.ReferencePipeline.findFirst(ReferencePipeline.java:543)
12:29:59  	at io.jenkins.plugins.checks.api.ChecksPublisherFactory.fromRun(ChecksPublisherFactory.java:92)
12:29:59  	at io.jenkins.plugins.checks.api.ChecksPublisherFactory.fromRun(ChecksPublisherFactory.java:69)
12:29:59  	at io.jenkins.plugins.junit.checks.JUnitChecksPublisher.publishChecks(JUnitChecksPublisher.java:41)
12:29:59  	at hudson.tasks.junit.JUnitResultArchiver.parseAndSummarize(JUnitResultArchiver.java:303)
12:29:59  	at hudson.tasks.junit.pipeline.JUnitResultsStepExecution.run(JUnitResultsStepExecution.java:63)
12:29:59  	at hudson.tasks.junit.pipeline.JUnitResultsStepExecution.run(JUnitResultsStepExecution.java:29)
12:29:59  	at org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution.lambda$start$0(SynchronousNonBlockingStepExecution.java:47)
12:29:59  	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
12:29:59  	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
12:29:59  	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
12:29:59  	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
12:29:59  	at java.base/java.lang.Thread.run(Thread.java:834)

cc @XiongKezhi