feat: undelete should not be required for declarative-friendly interfaces

[andrei-scripniciuc]

according to https://google.aip.dev/164#declarative-friendly-resources:

Soft-deletable resources have a poorer experience than hard-deleted resources in declarative clients

this contradicts the requirement that declarative-friendly interfaces implement soft-delete.

[noahdietz]

Please remove the appropriate docs/ page as well

[conventional-commit-lint-gcf]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

-- conventional-commit-lint bot
https://conventionalcommits.org/

[bgrant0607]

There are more occurrences:
https://github.com/search?q=repo%3Agoogleapis%2Fapi-linter%20declarativeFriendlyRequired&type=code

[bgrant0607]

Ok, this is just removing the check from 164, not from everywhere.