Fix usage of pg_waldump --ignore option

[lubennikovaav]

Problem

Previously, the --ignore option was only used when reading from a single file.
With this PR pg_waldump -i is enough to open any neon WAL segments

Summary of changes

pg_waldump changes are in corresponding postgres repo PRs
neondatabase/postgres#416
neondatabase/postgres#417
neondatabase/postgres#418

Checklist before requesting a review

• I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.
• Do we need to implement analytics? if so did you add the relevant metrics to the dashboard?
• If this PR requires public announcement, mark it with /release-notes label and add several sentences in this section.

Checklist before merging

• Do not forget to reformat commit message to not include the above checklist

[github-actions]

2886 tests run: 2765 passed, 0 failed, 121 skipped (full report)

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Flaky tests (3)

Postgres 16

• test_vm_bit_clear_on_heap_lock: debug

Postgres 15

• test_vm_bit_clear_on_heap_lock: debug

Postgres 14

• test_partial_evict_tenant[relative_spare]: release

Code coverage* (full report)

• functions: 28.0% (6601 of 23539 functions)
• lines: 46.7% (46863 of 100357 lines)

* collected from Rust tests only

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_{The comment gets automatically updated with the latest test results
dd231dd at 2024-05-02T12:02:53.288Z :recycle:}