Fix: Update PR Playground Preview workflow: Replace deprecated pluginZipFile with pluginData

[hbhalodia]

What?

Closes #547

Why?

• PR updates the pr-playground-preview.yml workflow to use pluginData instead of pluginZipFile as pluginZipFile is now deprecated.

How?

• Update the workflow pr-playground-preview.yml to use pluginData.

Use of AI Tools

• None

Testing Instructions

1. Once PR merged and on next PR, click on try it in playground button in that PR.
2. It will open WordPress playground with this PR artifact.
3. Check the console, you should not see any deprecated warnings.

Screenshots or screencast

Changelog Entry

Changed: Update pr-playground-preview.yml to use pluginData instead of pluginZipFile.

[github-actions]

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Co-authored-by: hbhalodia <hbhalodia@git.wordpress.org>

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.20%. Comparing base (94f5d40) to head (3409c48).

Additional details and impacted files

@@            Coverage Diff             @@
##             develop     #548   +/-   ##
==========================================
  Coverage      71.20%   71.20%           
  Complexity      1150     1150           
==========================================
  Files             67       67           
  Lines           5563     5563           
==========================================
  Hits            3961     3961           
  Misses          1602     1602           

Flag	Coverage Δ
unit	71.20% <ø> (ø)

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