fix: Downgraded platform_without_parent_station notice to info

[jcpitre]

Summary:

Downgraded platform_without_parent_station notice to info.
Relocated the notice to the info section in RULES.md

Expected behavior:

If a stop has no parent station and no platform, it will issue an INFO notice instead of a WARNING.

Please make sure these boxes are checked before submitting your pull request - thanks!

• Run the unit tests with gradle test to make sure you didn't break anything
• Format the title like "feat: [new feature short description]". Title must follow the Conventional Commit Specification(https://www.conventionalcommits.org/en/v1.0.0/).
• Linked all relevant issues
  • Closes Downgrade PlatformWithoutParentStation to Info #1328
• Include screenshot(s) showing how this pull request works and fixes the issue(s)

[github-actions]

❌ Invalid acceptance test.
New Errors: 0 out of 1428 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Errors: 0 out of 1428 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
New Warnings: 0 out of 1428 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Warnings: 35 out of 1428 datasets (~2%) are invalid due to code change, which is above the provided threshold of 1%.
0 out of 1428 sources (~0 %) are corrupted.
Commit: 2228a22
Download the full acceptance test report here (report will disappear after 90 days).
❌ Invalid acceptance test.

[jcpitre]

This change made a bunch of warning notices become info notices.
The comparator would give errors since there were too many differences in the outputs.
I had to skip the tests by putting [acceptance test skip] in the commit message.
See https://github.com/MobilityData/gtfs-validator/blob/master/docs/ACCEPTANCE_TESTS.md#instructions-to-run-the-pipeline

We should consider having a way to ignore specific items in the comparison (e.g. anything related to platform_without_parent_station should be ignored).
Maybe it's already there?

[davidgamez]

LGTM!

[github-actions]

❌ Invalid acceptance test.
New Errors: 0 out of 1428 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Errors: 0 out of 1428 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
New Warnings: 0 out of 1428 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Warnings: 34 out of 1428 datasets (~2%) are invalid due to code change, which is above the provided threshold of 1%.
0 out of 1428 sources (~0 %) are corrupted.
Commit: a88eb5b
Download the full acceptance test report here (report will disappear after 90 days).
❌ Invalid acceptance test.

[davidgamez]

❌ Invalid acceptance test. New Errors: 0 out of 1428 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%. Dropped Errors: 0 out of 1428 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%. New Warnings: 0 out of 1428 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%. Dropped Warnings: 34 out of 1428 datasets (~2%) are invalid due to code change, which is above the provided threshold of 1%. 0 out of 1428 sources (~0 %) are corrupted. Commit: a88eb5b Download the full acceptance test report here (report will disappear after 90 days). ❌ Invalid acceptance test.

This failure is expected as the PR downgrades a notice from warning to info.