fix: consolidate backend secret custom resources

[awsluja]

Problem

This consolidates secret fetcher custom resources into one.

A single custom resource will be created, instead of a resource for each secret.

Issue number, if available: https://github.com/aws-amplify/amplify-backend/issues/1797 https://github.com/aws-amplify/amplify-backend/issues/1825

Changes

Corresponding docs PR, if applicable:

Validation

Checklist

• [ ] If this PR includes a functional change to the runtime behavior of the code, I have added or updated automated test coverage for this change.
• [ ] If this PR requires a change to the Project Architecture README, I have included that update in this PR.
• [ ] If this PR requires a docs update, I have linked to that docs PR above.
• [ ] If this PR modifies E2E tests, makes changes to resource provisioning, or makes SDK calls, I have run the PR checks with the run-e2e label set.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: ad0a9112ab031b541c06ca488b7ba85658b5f700

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | -------------------- | ----- | | @aws-amplify/backend | Patch |

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR