CLOUDP-280225: Refactor integration secret checks

[josvazg]

Atlas redacts integrations secrets for security reasons, which means we cannot:

• Compare them to check whether they need to be re-applied or not.
• Detect whether or not applied secrets got properly set.

This change preserves that behaviour without assuming any extension to this behaviour coming any time soon. A proper fix will have to come from Atlas, for instance, sending a hash of the secret that allows comparison by applying the same on the client side.

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[github-actions[bot]]

https://app.codecov.io/github/mongodb/mongodb-atlas-kubernetes/commit/048afd4b3d2defb6b032a07de5da2953c3af8e45

[josvazg]

Will hold until @s-urbaniak can review this one

[josvazg]

Alternatively we could just remove the secret values from comparisons, so we only take into account Kubernetes changes, and ignore changes from Atlas.