Reduce page size to improve stability and enhance error log

[unidevel]

Fix the issue #37

Before PR applied

java.lang.RuntimeException: com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `java.util.LinkedHashMap` out of START_ARRAY token
 at [Source: (String)"{"data":{"createPullRequest":{"pullRequest":null}},"errors":[{"type":"UNPROCESSABLE","path":["createPullRequest"],"locations":[{"line":2,"column":5}],"message":"A pull request already exists for unidevel:dev."}]}"; line: 1, column: 61] (through reference chain: java.util.LinkedHashMap["errors"])
        at com.facebook.presto.release.git.GithubGraphQlAction.githubApi(GithubGraphQlAction.java:199)
        at com.facebook.presto.release.git.GithubGraphQlAction.createPullRequest(GithubGraphQlAction.java:176)
        at com.facebook.presto.release.tasks.GenerateReleaseNotesTask.run(GenerateReleaseNotesTask.java:112)
        at com.facebook.presto.release.tasks.AbstractReleaseCommand.run(AbstractReleaseCommand.java:50)
        at com.facebook.presto.release.PrestoReleaseService.main(PrestoReleaseService.java:38)
Caused by: com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `java.util.LinkedHashMap` out of START_ARRAY token
 at [Source: (String)"{"data":{"createPullRequest":{"pullRequest":null}},"errors":[{"type":"UNPROCESSABLE","path":["createPullRequest"],"locations":[{"line":2,"column":5}],"message":"A pull request already exists for unidevel:dev."}]}"; line: 1, column: 61] (through reference chain: java.util.LinkedHashMap["errors"])
        at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:63)
        at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1343)
        at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1139)
        at com.fasterxml.jackson.databind.DeserializationContext.handleUnexpectedToken(DeserializationContext.java:1093)
        at com.fasterxml.jackson.databind.deser.std.StdDeserializer._deserializeFromEmpty(StdDeserializer.java:600)
        at com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:360)
        at com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:29)
        at com.fasterxml.jackson.databind.deser.std.MapDeserializer._readAndBindStringKeyMap(MapDeserializer.java:527)
        at com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:364)
        at com.fasterxml.jackson.databind.deser.std.MapDeserializer.deserialize(MapDeserializer.java:29)
        at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4013)
        at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3023)
        at com.facebook.presto.release.git.GithubGraphQlAction.githubApi(GithubGraphQlAction.java:196)
        ... 4 more

After PR applied, the GraphQL error can be more clear

2025-01-29T15:41:07.064Z        ERROR   main    Bootstrap       Uncaught exception in thread main
java.lang.RuntimeException: GraphQL error: [{type=UNPROCESSABLE, path=[createPullRequest], locations=[{line=2, column=5}], message=Head sha can't be blank, Base sha can't be blank, No commits between prestodb:master and unidevel:dev, Head ref must be a branch}]
        at com.facebook.presto.release.git.GithubGraphQlAction.githubApi(GithubGraphQlAction.java:205)
        at com.facebook.presto.release.git.GithubGraphQlAction.createPullRequest(GithubGraphQlAction.java:177)
        at com.facebook.presto.release.tasks.GenerateReleaseNotesTask.run(GenerateReleaseNotesTask.java:112)
        at com.facebook.presto.release.tasks.AbstractReleaseCommand.run(AbstractReleaseCommand.java:50)
        at com.facebook.presto.release.PrestoReleaseService.main(PrestoReleaseService.java:38)