Standarizing output spanning tree functions

[cvvergara]

Fixes #2605 .

Changes proposed in this pull request:

• SQL add 'pred` column
• C add pred column
• Adjust documentation to new results
• Adjust pgtap test
• Add migration guide

@pgRouting/admins

[cvvergara]

TODO

test that the predecessors are correct

[cvvergara]

Those tests should also cover pgr_drivingDistance and pgr_withPointsDD

[cvvergara]

TODO

• Verify the upgrade scripts

[cvvergara]

TODO

• the signature file is not up to date

[cvvergara]

predecessors check will be in another PR

[cvvergara]

Upgrade test is passing
https://github.com/cvvergara/pgrouting/actions/runs/7574653170

[coderabbitai]

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