MWPW-202977 [MEP] Enable insertion/replace of block rows or cells with fragments

[vgoodric]

Summary
Enhance personalization fragment insertion for row and cell targets, including nested inline fragments.

Changes

• Updated personalization fragment creation to identify section, row, and cell insertion contexts.
• Preserve valid row and cell structure by avoiding paragraph wrappers where they are not appropriate.
• Add replacement container metadata with data-mep-replace-type for row and cell insertions.
• Update inline fragment handling to:

1. Extract the correct content from row and cell fragment structures.
2. Remove unnecessary section wrappers.
3. Resolve nested fragments within row and cell insertions.
4. Preserve existing behavior for standard fragment insertion and MEP in-block replacements.

• Added fragment unit coverage for nested content inserted into a row.
• Updated personalization functional test selectors to verify the actual replacement anchors rather than assuming they are descendants of a paragraph.

Resolves: MWPW-202977

Test URLs:

• Before: https://main--upp--adobecom.aem.page/homepage/index-loggedout-fragmented?mep=%2Fdrafts%2Fmepdev%2Frowcol-feature-upp.json--hp-router-marquee
• After: https://main--upp--adobecom.aem.page/homepage/index-loggedout-fragmented?mep=%2Fdrafts%2Fmepdev%2Frowcol-feature-upp.json--hp-router-marquee&milolibs=mep-rowcol-v2

Compare the before and after link. The before link has unintended behavior, but the after link cleanly replaces the row.
Before:

After:

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Commits

• 5d9b919 ✅ (latest)
• 592f078 ✅
• 6545d95 ✅
• b9f7470 ✅
• bbd8117 ✅
• ca5e05f ✅
• cf352fd ✅

[milo-pr-merge]

Skipped merging 6742: MWPW-202977 [MEP] Enable insertion/replace of block rows or cells with fragments due to failing or running checks