Temporarily disable Java FFE evaluation tests

[leoromanovsky]

Motivation

Java FFE evaluation metrics system tests exercise flag allocations that include ISO8601 startAt/endAt window dates. The current Java tracer mainline still has a date-model/parsing mismatch for those allocation windows: system-tests provides ISO8601 strings, while Java needs the Instant allocation-window parsing/model change in DataDog/dd-trace-java#11535. Until that Java tracer PR lands, these evaluation metrics tests fail for a known tracer-side Instant mismatch rather than a system-tests regression.

This PR temporarily disables the Java evaluation metrics manifest entry so system-tests does not gate on that pending Java tracer fix. We will re-enable the entry once DataDog/dd-trace-java#11535 lands on main.

Changes and Decisions

This PR changes the Java manifest entry for tests/ffe/test_flag_eval_metrics.py from the spring-boot version gate to bug (FFL-2339). The file-level manifest rule matches all tests in test_flag_eval_metrics.py, including the metric-count child test, so this keeps the disablement scoped to Java FFE evaluation metrics and leaves the EVP manifest entry unchanged.

Validation

• ./format.sh progressed through mypy, ruff, whitespace, yamlfmt, yamllint, manifest parser, and shellcheck checks; local Docker failed at the later Node lint stage with a containerd input/output error.
• ./venv/bin/yamlfmt -lint manifests/
• ./venv/bin/yamllint -s manifests/
• ./venv/bin/python utils/manifest/validate.py
• git diff --check
• Manifest behavior check confirmed Java spring-boot eval-metrics nodeids resolve to bug (FFL-2339).

[github-actions]

CODEOWNERS have been resolved as:

manifests/java.yml                                                      @DataDog/asm-java @DataDog/apm-java