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feat(dataTable): improve repeat group responses handling DEV-2400 (#7226)

### 📣 Summary

Data Table repeat-group handling was stabilized for nested structures:
values no longer disappear for valid nested repeat paths, andrepeat
answers are (still) shown as a simple flat comma-separated list.

### 💭 Notes

Changes in this PR:

1. Fixed the main issue where repeat-related Data Table cells could
appear empty even though submission data existed.
2. Improved repeat path traversal so nested answers are found even when
data is stored under parent repeat/group branches rather than the exact
column key.
3. Preserved compatibility behavior (including deleted attachment
rendering) while simplifying repeat formatting flow.
4. Expanded/updated tests for repeat edge cases:
   - nested repeats and repeats-inside-repeats,
   - deep multi-level nesting,
   - missing/invalid branches,
   - unanswered branches with placeholder mode,
   - deleted media attachments.

Why this helps:

1. Users see actual repeat answers instead of blank cells in nested
scenarios.
2. Table output is simpler and consistent with prior behavior
expectations (plain inline list).
3. Repeat extraction logic is easier to maintain and safer to evolve.

### 👀 Preview steps

1. Have a project [Nested Repeat
Houses.xlsx](https://github.com/user-attachments/files/29805525/Nested.Repeat.Houses.xlsx)
and at least one submission with deep nested data (Countries → Cities →
Streets → Houses → Inhabitants).
2. Go to Project → Data → Table.
3. Locate the column Countries / Cities / Streets / Houses / Inhabitants
/ Inhabitant name.
4. On main, nested repeat values may be blank or inconsistently resolved
in some cases.
5. On PR, values are resolved and rendered inline as a flat
comma-separated list.
6. Optionally verify another nested column (for example Inhabitant age)
to confirm repeat-path handling is consistent.
7. Optionally verify incomplete responses and deleted attachments still
display safely.

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