Add coverage for pgtle.sh 'stable' pseudo-version support (issue #57)

[jnasbyupgrade]

Summary

Paired with pgxntool PR Postgres-Extensions/pgxntool#63, which fixes pgtle.sh's extract_version_from_filename() rejecting non-numeric version aliases like stable (issue #57).

• Adds one test, pgtle: stable pseudo-version alias is not rejected (issue #57), right after the existing whitespace-parsing regression test in test/sequential/04-pgtle.bats.
• It creates a temp control file plus a base numeric version file (stable_test--1.0.0.sql), a base stable version file (stable_test--stable.sql), and a numeric-to-stable upgrade path (stable_test--1.0.0--stable.sql), then runs pgtle.sh --extension stable_test --pgtle-version 1.5.0+ and checks the generated SQL registers both versions, the upgrade path, and set_default_version.
• Kept to a single consolidated @test (multiple related assertions) rather than splitting into several, per this repo's guidance on BATS per-test overhead.

Test plan

• Full suite passes: 216/216, 0 failures, 0 skips (run against the tletest PG cluster, PGCLUSTER=17/tletest PGPORT=5418, so pg_tle coverage was fully exercised).
• New test confirmed passing end-to-end (ok 54 pgtle: stable pseudo-version alias is not rejected (issue #57)), driven through the full pgtle.sh CLI path.

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