-DskipTests alone does not skip the unit suite, so CI steps and runtime legs run all of it

[saurabhjain1592]

What happens

pom.xml binds surefire's skipTests to the project's own property: <skipTests>${skipUnitTests}</skipTests> (line 232), with skipUnitTests defaulting to false (line 101). A plugin configuration value overrides a command-line user property, so -DskipTests on its own does not skip the unit suite, and Maven runs all of it.

Measured on one test class, on main at 060b9c683:

• mvn -DskipTests -Dtest=V11ProvenanceTest test ran it: Tests run: 10.
• Adding -DskipUnitTests=true printed Tests are skipped.

Where it bites (counted on main at 060b9c683)

Workflow steps that pass -DskipTests alone, and so run the whole unit suite:

• .github/workflows/ci.yml:318: the package job's mvn package -DskipTests.
• .github/workflows/heartbeat-real-stack.yml:66: mvn -B -DskipTests package.
• .github/workflows/integration.yml:103: mvn install -DskipTests.
• .github/workflows/release.yml:155: mvn clean deploy -Prelease -DskipTests. Whether a release should run the suite is its own call, but the flag does not do what it reads as doing.

ci.yml:159 (the examples job) already passes -DskipUnitTests=true.

Runtime-e2e:

• 2 executable script(s) build this way: runtime-e2e/read_path_identity/run.sh, runtime-e2e/sandbox_telemetry_stream_tag/test.sh.
• 13 leg source file(s) tell the reader to build with -DskipTests alone in their usage comments.
• 15 README file(s) under runtime-e2e/ do the same.

The cost is time and noise, not a wrong result: the suite passes, it just runs where nobody asked for it. A local production-posture run of #236's leg spent minutes, and wrote a 52 MB log, on the unit suite before the leg itself ran. #236 fixed its own run.sh.

Fix

Either:

1. pass -DskipUnitTests=true everywhere the intent is to skip unit tests; or
2. make the binding honour both properties, so that -DskipTests works as Maven users expect and mvn verify -DskipUnitTests=true keeps running only failsafe.

The second fixes every site above at once.

Target: v11.1.0.