Rename recently added CRAM tests to the house naming convention

[tfenne]

Follow-up hygiene on my own recent PRs — no behaviour change.

Three test classes added in #1789, #1791 and #1792 used snake_case method names without the conventional test prefix. That is neither idiomatic Java nor what this repo does; measured across src/test/java:

• 2020 of 2417 test methods start with test
• only 199 of 2417 contain an underscore at all

This renames the nine offending methods in those three classes to testXxx camelCase:

Class	Methods renamed
CRAMContainerStreamWriterClosureTest	4
CRAMFileReaderNonSeekableStreamTest	2
ReferenceSourceConcurrencyTest	3

The fourth affected class, CRAMReferenceRegionErrorMessageTest (from #1790), has its three methods renamed in #1793 instead, since that file is already being modified there.

Test bodies are untouched — naming only. Full CRAM suite green.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: d376fe7a-3d6b-474e-858a-09d71289eaf0

📥 Commits

Reviewing files that changed from the base of the PR and between a431e97 and d26c569.

📒 Files selected for processing (3)

• src/test/java/htsjdk/samtools/cram/CRAMContainerStreamWriterClosureTest.java
• src/test/java/htsjdk/samtools/cram/CRAMFileReaderNonSeekableStreamTest.java
• src/test/java/htsjdk/samtools/cram/ref/ReferenceSourceConcurrencyTest.java

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch tf_fix_test_naming

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