fix: Don't fail on required rclone options that have default values

[eikek]

This is just my guess - not sure how to test it.

https://www.notion.so/renku/When-I-m-filling-out-the-S3-data-connector-config-the-endpoint-field-looks-like-it-s-already-filled-9367f45f66674a269cab971728bd1353

/deploy

[RenkuBot]

You can access the deployment of this PR at https://renku-ci-ds-1077.dev.renku.ch

[coveralls]

Pull Request Test Coverage Report for Build 18901460589

Details

• 1 of 3 (33.33%) changed or added relevant lines in 1 file are covered.
• 4 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.01%) to 86.818%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
components/renku_data_services/storage/rclone.py	1	3	33.33%

Files with Coverage Reduction	New Missed Lines	%
components/renku_data_services/notebooks/util/retries.py	1	59.38%
components/renku_data_services/session/models.py	1	95.33%
components/renku_data_services/crc/core.py	2	77.96%

Totals
Change from base Build 18900465468:	0.01%
Covered Lines:	22722
Relevant Lines:	26172

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💛 - Coveralls

[leafty]

Code looks OK, it would be nice if we could test actually mounting 😅 .

[eikek]

Fyi, I have credentials to test and it turned out that these default values have to be injected at the correct places.