Add coverage for PGXNTOOL_ENABLE_FS_INSTALL / PGXNTOOL_ENABLE_PGXN_INSTALL

[jnasbyupgrade]

Summary

• Adds BATS coverage for pgxntool PR Add PGXNTOOL_ENABLE_FS_INSTALL and PGXNTOOL_ENABLE_PGXN_INSTALL pgxntool#91, which adds PGXNTOOL_ENABLE_FS_INSTALL (gates install out of test/verify-results/installcheck/test-build, for existing-mode/pg_tle-style testing -- issues util.sh: micro-optimize array_not_empty comparison #55, #90) and PGXNTOOL_ENABLE_PGXN_INSTALL (independently gates pgtap's own pgxn install --sudo auto-install, defaulting to follow PGXNTOOL_ENABLE_FS_INSTALL).
• Extends test/standard/make-test.bats: default/override/independent-override behavior, structural proof via make -p -n that install/pgtap prerequisites are genuinely removed, a dry-run proof (fake DESTDIR) that the pgxn install pgtap --sudo recipe disappears when disabled, and end-to-end proof that make test PGXNTOOL_ENABLE_FS_INSTALL=no succeeds against an already-installed tree but fails against a genuinely uninstalled one.
• Also tightens two installcheck prerequisite-list assertions (the pre-existing issue #79 one and the new one) to match the exact install token instead of a grep -w substring, which false-matched inside the unrelated test/install/schedule path.

Test plan

• test/standard/make-test.bats (35/35 passed)
• Full test-all suite (257/257 passed, 0 skipped)

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