profiles relationship cleanup

[ajtmccarty]

fixes #3791 we will always generate the profiles relationships during schema loading

• migration to remove profiles SchemaRelationship from the database. saving them to the database at all was my oversight from the first time working on profiles
• make sure we do not ever save/load profiles RelationshipSchema from/to the database

NOTE: I saw some generate_profile is not a valid input for SchemaGeneric at generate_profile errors a couple of times in the server logs after loading all the demo data on an older version of infrahub and then upgrading to the 0.15 release, but I am not sure where the error came from and did not see it in the front-end anywhere

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #3792 will degrade performances by 33.04%

_{Comparing 3791-profiles-relationship-cleanup (40a3ea9) with develop (1fdf808)}

Summary

❌ 1 regressions ✅ 9 untouched benchmarks

:warning: Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	develop	3791-profiles-relationship-cleanup	Change
❌	test_load_node_to_db_node_schema	50 ms	74.7 ms	-33.04%

[ogenstad]

Changed to target release-0.15 branch after GitHub automatically changed it to develop.