[RelEng] Add individual release preparation script for PDE

[HannesWell]

It will be called by the pipeline to prepare a new development cycle and automates the enforced qualifier update and clean-up of the 'forceQualifierUpdate.txt' files of the PDE doc bundle.

This will avoid doing it manually as done for the current cycle in

• Prepare 4.38 development #1948 (comment)

[github-actions]

Test Results

   765 files  +  147     765 suites  +147   50m 6s ⏱️ + 3m 3s
 3 611 tests ±    0   3 556 ✅ ±    0   54 💤 ± 0  1 ❌ ±0 
10 833 runs  +2 650  10 669 ✅ +2 626  163 💤 +24  1 ❌ ±0 

For more details on these failures, see this check.

Results for commit 34d2963. ± Comparison against base commit 69e93d2.

[HannesWell]

Testing was successful but the verification build doesn't test this, thus submitting this without await it.