Replace "identifer" with "identifier" in docs and code

[bencomp]

What this PR does / why we need it:
Fix a typo across the documentation and codebase: identifer becomes identifier.

Which issue(s) this PR closes:

Closes #7138

Special notes for your reviewer:
In case outside code somehow relies on the old spelling of public method names with typos, I created a copy and marked it as deprecated. Sonarlint then wants a Javadoc comment about the deprecation, so I added that too.
When I fixed the typo in a logging statement that performed string concatenation, I replaced the call with a different method that uses string formatting – a code optimisation.

Suggestions on how to test this: nothing special.

Does this PR introduce a user interface change? If mockups are available, please link/include them here: no

Is there a release notes update needed for this change?: no

Additional documentation: no

[pdurbin]

I really wish Jenkins tests were passing. That's this issue:

• Review and fix current failing tests (EC2 spin up failing) #10024

Meanwhile, I kicked off a run here: https://github.com/gdcc/api-test-runner/actions/runs/6569210124

[bencomp]

Thanks, @pdurbin. That test run failed, but I don't think it's my fault – I didn't touch FilesIT or the code that it calls.

[pdurbin]

@bencomp oh! You can see logs from https://github.com/gdcc/api-test-runner/actions/runs/6569210124 ?!? That's great! @lubitchv can you see them?

Related issue:

• Let contributors know why tests are failing #9916

[lubitchv]

Yes, In manual.yml I clicked api and could see that it failed on "FilesIT.testDeleteFile:2002 1 expectation failed."

[pdurbin]

@lubitchv that's great news!

[pdurbin]

@bencomp I moved this to Ready for Review. We talked about it at standup just now.

[pdurbin]

I kicked off another run: https://github.com/gdcc/api-test-runner/actions/runs/6578559376

I do agree that the changes shouldn't be breaking any tests.

[bencomp]

It passed 🎉

[pdurbin]

Sure did! Great. I think I'll let someone else take a look before we send this to QA. No standup tomorrow but I'll try to remember to mention it on Monday if someone hasn't picked it up by then.

[qqmyers]

Looks good!