ci: avoid duplicate parametric system tests

[bm1549]

Description

Link (AppGate required)

Tracer-release jobs currently run PARAMETRIC once per weblog, then the dedicated parametric job runs it again. This passes --excluded-scenarios PARAMETRIC to the scenario producer and leaves the dedicated blocking job unchanged.

The generated jobs now extract endtoend_defs.parallel_jobs with a small inline Python block. It sorts and deduplicates scenario names, and fails with one generic error if the producer or parser fails, the result is empty, a name is non-string or contains whitespace, or PARAMETRIC remains.

Expected impact: 26 parametric executions become 1. Based on the CI Visibility sample, that avoids about 7.5 executor-hours per full run. Wall-clock improvement is limited by the next critical-path job.

This revision removes the two Python files and the extra CI test job. The net PR changes only .gitlab/generate-package.php.

Tested with:

• PHP lint and git diff --check
• Generated package YAML parse and Bash syntax check
• All 25 generated tracer-release jobs checked for an identical extraction block
• Exact embedded parser exercised with canonical, duplicate, empty, malformed, non-string, whitespace-containing, and residual PARAMETRIC inputs

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[datadog-official]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🔄 Datadog auto-retried 2 jobs - 2 passed on retry

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 59.62% (-1.01%)

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