Align inline expectation annotations with current query behavior and relearn affected expected outputs

[Copilot]

This PR updates stale inline expectation annotations (// $ ...) so they describe current query behavior, then regenerates the corresponding .expected files via --learn for the scoped C#, Java (quantum examples), Python, and Ruby tests. The goal is to remove misleading testFailures noise caused by annotation drift, not to change query/program logic.

• C# inline expectation cleanup

  • Updated /csharp/ql/test/utils/inline-tests/InlineTests.cs annotations to correctly scope tags and mark known misses with MISSING: where behavior is intentionally not present.
  • Relearned:
    • PathProblemQuery.expected
    • PathProblemQueryRelatedLocs.expected
    • ProblemQuery.expected
    • ProblemQueryRelatedLocs.expected

• Java quantum example annotation alignment

  • Updated inline annotations in:
    • /java/ql/test/experimental/query-tests/quantum/examples/BadMacUse/BadMacUse.java
    • /java/ql/test/experimental/query-tests/quantum/examples/InsecureOrUnknownNonceSource/InsecureIVorNonceSource.java
    • /java/ql/test/experimental/query-tests/quantum/examples/WeakOrUnknownKDFIterationCount/Test.java
  • Adjusted expectation semantics (MISSING:, alert placement) to match actual result locations.
  • Relearned all listed affected .expected files in these directories.

• Python/Ruby inline expectation updates

  • Updated inline annotations in:
    • /python/ql/test/experimental/meta/inline-taint-test-demo/taint_test.py
    • /ruby/ql/test/library-tests/dataflow/string-flow/string_flow.rb
    • /ruby/ql/test/library-tests/frameworks/action_controller/filter_flow.rb
    • /ruby/ql/test/library-tests/frameworks/active_support/hash_extensions.rb
    • /ruby/ql/test/library-tests/frameworks/sinatra/views/index.erb
    • /ruby/ql/test/query-tests/experimental/improper-memoization/improper_memoization.rb
  • Relearned corresponding .expected files to reflect updated inline expectations.

• Out-of-scope runtime blocker (Kotlin summaries)

  • The two Kotlin summary targets from the original failure list could not be relearned in this environment due to extractor failure on -language-version 1.9 (current toolchain requires 2.0+), so no unreconciled manual .expected edits were introduced there.

// Before
byte[] plaintext = cipher.doFinal(ciphertext); // $ Source

// After (documented current behavior)
byte[] plaintext = cipher.doFinal(ciphertext); // $ MISSING: Source