improve: do not allow to bulk remove identity providers

[aditya-mitra]

Summary

Identity Providers should not be allowed to be removed in bulk via API.
Remove identity provider only if id is present (i.e. only allow single remove)
Made corresponding changes for the unit tests

References

Refs #7739 (comment)

Checklist

• If this PR is still a WIP, convert to a draft
• When this PR is ready, mark it as "Ready for review"
• ensure all checks pass
• Changes have been manually QA'd
• Changes reviewed by at least 2 approved reviewer

QA Steps

[speigg]

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