MWPW-199855: Add Fragment Paste feature to promos Consolidate Items Selector

[Andrei4226]

Resolves https://jira.corp.adobe.com/browse/MWPW-199855
QA Checklist: https://wiki.corp.adobe.com/display/adobedotcom/M@S+Engineering+QA+Use+Cases

Consolidate promotions item picker with the shared items selector

Removed the duplicate mas-promotions-items-selector component and switched promotions to use the same shared mas-items-selector component already used by translations and other pickers so same UI, less code to maintain, same behavior as before for promotions.

• Made the shared selector configurable enough to cover promotions needs (offer/surface filters, promo variation table) without duplicating logic.
• Enabled the "Import via URL" feature for promotions (previously missing there).
• Imported fragments in promotions must now belong to one of the surfaces and one of the offers already selected on the promotion project, otherwise they're rejected with a clear message.
• No behavior change for translations or other existing consumers of "Import via URL" or item selection.

Test link: https://mwpw-199855--mas--adobecom.aem.live/studio.html#page=promotions-editor&path=sandbox&promotionId=134e22a3-c428-487a-8197-377471e6a690

Please do the steps below before submitting your PR for a code review or QA

• C1. Cover code with Unit Tests
• C2. Add a Nala test (double check with #fishbags if nala test is needed)
• C3. Verify all Checks are green (unit tests, nala tests)
• C4. PR description contains working Test Page link where the feature can be tested
• C5: you are ready to do a demo from Test Page in PR (bonus: write a working demo script that you'll use on Thursday, you can eventually put in your PR)
• C.6 read your Jira one more time to validate that you've addressed all AC's and nothing is missing

🧪 Nala E2E Tests

Nala tests run automatically when you open this PR.

To run Nala tests again:

1. Add the run nala label to this PR (in the right sidebar)
2. Tests will run automatically on the current commit
3. Any future commits will also trigger tests as long as the label remains

To stop automatic Nala tests:

• Remove the run nala label

Note: Tests only run on commits if the run nala label is present. Add the label whenever you need tests to run on new changes.

Test URLs:

• Before: https://main--mas--adobecom.aem.live/
• After: https://mwpw-199855--mas--adobecom.aem.live/

[aem-code-sync]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch.
In case there are problems, just click the checkbox below to rerun the respective action.

• Re-sync branch

Commits

• f69e72c ✅ (latest)
• 120cda5 ✅
• 0c6b174 ✅
• e15e125 ✅
• 40367a2 ✅
• be7db56 ✅

[github-actions]

SNOW Change Request Transaction ID [STUDIO]: 0000019c1eec85a3-20b770b1

[codecov]

Codecov Report

❌ Patch coverage is 90.48780% with 39 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.72%. Comparing base (3174cbf) to head (f69e72c).

Files with missing lines	Patch %	Lines
studio/src/promotions/mas-promotions-editor.js	83.41%	33 Missing ⚠️
studio/src/common/components/mas-items-selector.js	94.49%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1206      +/-   ##
==========================================
- Coverage   90.76%   90.72%   -0.04%     
==========================================
  Files         319      318       -1     
  Lines      101832   101758      -74     
==========================================
- Hits        92428    92322     -106     
- Misses       9404     9436      +32     

Files with missing lines	Coverage Δ
...io/src/common/components/mas-items-selector.css.js	100.00% <100.00%> (ø)
...io/src/common/components/mas-search-and-filters.js	91.35% <100.00%> (-0.80%)	⬇️
studio/src/common/utils/render-utils.js	100.00% <100.00%> (ø)
studio/src/promotions/promotion-editor-utils.js	99.05% <100.00%> (-0.12%)	⬇️
studio/src/common/components/mas-items-selector.js	98.07% <94.49%> (-0.03%)	⬇️
studio/src/promotions/mas-promotions-editor.js	92.01% <83.41%> (-0.60%)	⬇️

... and 8 files with indirect coverage changes

---

Continue to review full report in Codecov by Harness.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3174cbf...f69e72c. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.