[gen:oar-prop] Deal with adding nodes to clusters (#14865)

This commit modifies how the generator deals with cases where new resources are added to an existing cluster, which was not supported up to now.

The same code is now used for adding nodes to an existing cluster, and for adding a completely new cluster.

added 18 commits

• d3dcc0d3...000d1093 - 15 commits from branch master
• 74db9592 - [gen:oar-prop] Deal with adding nodes to clusters (#14865)
• e8f5f308 - [gen:oar-prop] those cases no longer fail and are handled transparently
• d0069365 - [gen:oar-prop] Those cases are detected a bit earlier in the new code

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requested review from @lpouillo

added 16 commits

• d0069365...a912e684 - 13 commits from branch master
• c147fc76 - [gen:oar-prop] Deal with adding nodes to clusters (#14865)
• 563d77e3 - [gen:oar-prop] those cases no longer fail and are handled transparently
• ba3bdf28 - [gen:oar-prop] Those cases are detected a bit earlier in the new code

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added 1 commit

• cd662fed - [gen:oar-prop] fix comment

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resolved all threads

approved this merge request

added 32 commits

• cd662fed...825a2cae - 28 commits from branch master
• db461f4d - [gen:oar-prop] Deal with adding nodes to clusters (#14865)
• 9314e9c5 - [gen:oar-prop] those cases no longer fail and are handled transparently
• 40ae3d6e - [gen:oar-prop] Those cases are detected a bit earlier in the new code
• 789c20fa - [gen:oar-prop] fix comment

Compare with previous version

enabled an automatic merge when the pipeline for 789c20fa succeeds

merged

mentioned in commit ca51a210