nbari / pg_exporter / 18804971480

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feat: add PostgreSQL version compatibility for collectors

Added graceful handling for collectors that use PostgreSQL 17+ views
when running on older versions. The collectors now:

- Detect when required views don't exist (e.g., pg_stat_checkpointer)
- Log debug message and skip collection instead of failing
- Allow exporter to work on PostgreSQL 16, 17, and 18

Changes:
- checkpointer: requires PG 17+ (pg_stat_checkpointer introduced in 17)
- wal: requires PG 14+ (pg_stat_wal introduced in 14)
- archiver: works on all versions (pg_stat_archiver available since 9.4)
- Fixed flaky connection test by keeping active connection during test
- Re-added PostgreSQL 16 to test matrix

This ensures the exporter works on older PostgreSQL versions by
gracefully skipping collectors that depend on newer statistics views.

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