fix(postgresql): preserve PITR timeline history

[weicao]

What

Pull PostgreSQL timeline-history archives for PITR, but bypass pg_waldump transaction inspection for those non-WAL files.

Why

Timeline-history files are required by recovery across timelines, but they are metadata, not WAL segments. The restore traversal pulled them and then treated pg_waldump rejection as a hard WAL-inspection failure, aborting preparation before handoff.

Tests

• RED (70eecc321): Bash 3.2 focused ShellSpec, 17 examples / 1 failure / 2 failed assertions
• GREEN: Bash 3.2 focused ShellSpec, 17 examples / 0 failures
• GREEN: Bash 5.3 full PostgreSQL ShellSpec, 285 examples / 0 failures
• ShellCheck error severity, Bash syntax, and git diff --check
• helm lint addons/postgresql: 1 chart / 0 failures
• helm template: 41 documents / 1,014,422 bytes

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (8b549e1) to head (30566f4).

Files with missing lines	Patch %	Lines
...ns/postgresql/scripts-ut-spec/pitr_restore_spec.sh	0.00%	9 Missing ⚠️

Additional details and impacted files

@@                         Coverage Diff                          @@
##           easton/pg-pitr-restore-object-filter   #3402   +/-   ##
====================================================================
  Coverage                                  0.00%   0.00%           
====================================================================
  Files                                       195     195           
  Lines                                     28380   28389    +9     
====================================================================
- Misses                                    28380   28389    +9     

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