Prevent rank math filter to erase previous content

[Soare-Robert-Daniel]

Closes #1955

Summary

Make the custom 'rank_math_content' filter to return its given content by params.

⚠️ It seems that not given the original content made some condition to show negative.

Screenshots

Without Otter

Current version

With fix

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Test instructions

1. Install MathRank
2. Make a page and check the store.
3. Install Otter with the fix and score that should remain the same or go higher*.

*The code was initially added to detect Post blocks. Check this #1874

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Checklist before the final review

• Included E2E or unit tests for the changes in this PR.
• Visual elements are not affected by independent changes.
• It is at least compatible with the minimum WordPress version.
• It loads additional script in frontend only if it is required.
• Does not impact the Core Web Vitals.
• In case of deprecation, old blocks are safely migrated.
• It is usable in Widgets and FSE.
• Copy/Paste is working if the attributes are modified.
• PR is following the best practices

[pirate-bot]

Bundle Size Diff

Package	Old Size	New Size	Diff
Animations	275.01 KB	275.01 KB	0 B (0.00%)
Blocks	1.48 MB	1.48 MB	51 B (0.00%)
CSS	89.3 KB	89.3 KB	0 B (0.00%)
Dashboard	132.27 KB	132.27 KB	0 B (0.00%)
Export Import	87.21 KB	87.21 KB	0 B (0.00%)
Pro	346.65 KB	346.65 KB	0 B (0.00%)

[pirate-bot]

Plugin build for 0171f32 is ready 🛎️!

• Download Otter – Page Builder Blocks & Extensions for Gutenberg - Production ~ Development
• Download Otter Pro - Production ~ Development
• Download Blocks Animation - Production ~ Development
• Download Blocks CSS - Production ~ Development
• Download Blocks Export Import - Production ~ Development

[pirate-bot]

E2E Summary

Typing

Test	Average Time (ms)	Standard Deviation (ms)	Median Time (ms)	Quantile for soft limit (%)	Quantile for hard limit (%)
Typing	73.54	10.1	75.08	21.05 (60ms)	73.68 (80ms)

Values above 60ms

"4 - 65.18, 5 - 79.88, 6 - 85.00, 7 - 75.08, 8 - 74.20, 9 - 82.74, 10 - 82.00, 11 - 72.91, 12 - 74.35, 13 - 78.52, 14 - 79.62, 15 - 74.09, 16 - 87.31, 17 - 81.43, 18 - 79.28"

[HardeepAsrani]

It's working well now, during the QA we can try to test it with a wide range of blocks with content, like a Section, Column and etc to confirm it works normally.

[irinelenache]

@Soare-Robert-Daniel @HardeepAsrani Tested and the issue is fixed, also tested some blocks and they are not negatively impacting the RankMath score 🚀

[pirate-bot]

🎉 This PR is included in version 2.5.0 🎉

The release is available on GitHub release

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