fix: save dynamic post content value

[girishpanchal30]

Closes #2618

Summary

Retrieve the post based on the context and extract its content.

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	271.64 KB	271.64 KB	0 B (0.00%)
Blocks	1.54 MB	1.54 MB	0 B (0.00%)
CSS	100.76 KB	100.76 KB	0 B (0.00%)
Dashboard	198.36 KB	198.36 KB	0 B (0.00%)
Onboarding	160.8 KB	160.8 KB	0 B (0.00%)
Export Import	97.73 KB	97.73 KB	0 B (0.00%)
Pro	407.08 KB	407.08 KB	0 B (0.00%)

[pirate-bot]

Plugin build for d368662 is ready 🛎️!

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[pirate-bot]

E2E Tests

Playwright Test Status:

Performance Results

serverResponse: {"q25":416.6,"q50":420.1,"q75":454.8,"cnt":10}, firstPaint: {"q25":461.9,"q50":482.7,"q75":534,"cnt":10}, domContentLoaded: {"q25":1576.1,"q50":1588.55,"q75":1592.4,"cnt":10}, loaded: {"q25":1576.6,"q50":1589,"q75":1592.9,"cnt":10}, firstContentfulPaint: {"q25":3305.7,"q50":3334.65,"q75":3340,"cnt":10}, firstBlock: {"q25":6813.8,"q50":6818.9,"q75":6836.1,"cnt":10}, type: {"q25":13.46,"q50":13.7,"q75":13.92,"cnt":10}, typeWithoutInspector: {"q25":11.59,"q50":12.13,"q75":12.31,"cnt":10}, typeWithTopToolbar: {"q25":15.73,"q50":17.63,"q75":19,"cnt":10}, typeContainer: {"q25":7.52,"q50":7.77,"q75":8.41,"cnt":10}, focus: {"q25":54.9,"q50":56.25,"q75":60.48,"cnt":10}, inserterOpen: {"q25":16.93,"q50":17.57,"q75":18.63,"cnt":10}, inserterSearch: {"q25":5.61,"q50":5.79,"q75":6.12,"cnt":10}, inserterHover: {"q25":2.84,"q50":3.02,"q75":3.48,"cnt":20}, loadPatterns: {"q25":1069.78,"q50":1112.04,"q75":1124.95,"cnt":10}, listViewOpen: {"q25":91.74,"q50":94.41,"q75":99.35,"cnt":10}

[pirate-bot]

🎉 This PR is included in version 3.1.8 🎉

The release is available on GitHub release

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