refactor: remove xwf functionality from backend

[alexzurbonsen]

Summary

[Merge after #13603.]

Relates to #13546. This PR removes xwf functionality from backend (swagger interfaces). It is removed from front end in #13603.

Test Plan

• CI
• Check if xwf field is removed from swagger API (https://localhost:9443/swagger/v1/ui)
  Used endpoints, that do not require a gateway ID, to check. is_xwfm_variant disappeared in post method of /cwf and example models of various other endpoints.

Additional Information

• This change is backwards-breaking

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[github-actions]

feg-workflow

    2 files  203 suites   40s ⏱️
374 tests 374 ✔️ 0 💤 0 ❌
388 runs  388 ✔️ 0 💤 0 ❌

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[github-actions]

dp-workflow

13 tests   13 ✔️  2m 2s ⏱️
  1 suites    0 💤
  1 files      0 ❌

Results for commit 14a858a.

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[github-actions]

cloud-workflow

1 009 tests   1 009 ✔️  2m 14s ⏱️
   356 suites         0 💤
       7 files           0 ❌

Results for commit 14a858a.

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[github-actions]

agw-workflow

615 tests   611 ✔️  3m 59s ⏱️
    2 suites      4 💤
    2 files        0 ❌

Results for commit 14a858a.

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[github-actions]

nms-workflow

0 tests   0 ✔️  0s ⏱️
0 suites  0 💤
0 files    0 ❌

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