revert: "chore: add AWSLINT_SAVE to the PR buildspec (#22743)" (#22782)

This reverts commit ea9ab4b.


----

### All Submissions:

* [ ] Have you followed the guidelines in our [Contributing guide?](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md)

### Adding new Unconventional Dependencies:

* [ ] This PR adds new unconventional dependencies following the process described [here](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md/#adding-new-unconventional-dependencies)

### New Features

* [ ] Have you added the new feature to an [integration test](https://github.com/aws/aws-cdk/blob/main/INTEGRATION_TESTS.md)?
	* [ ] Did you use `yarn integ` to deploy the infrastructure and generate the snapshot (i.e. `yarn integ` without `--dry-run`)?

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

buildspec-pr.yaml

@@ -2,16 +2,6 @@ version: 0.2
 
 # This buildspec is intended to be used by GitHub PR builds.
 
-env:
-  variables:
-    # Update package.json with "exclude" statements for all failing rules.
-    # Whenever a new attribute to any resource in the CFN spec, by default
-    # awslint will block the build because the attribute does not exist in 
-    # the corresponding L2 ('resource-attribute' rule). By ignoring it
-    # automatically, we save on-call time, and users who have lived without
-    # this attribute so far can wait for a bit longer.
-    AWSLINT_SAVE: "true"
-
 phases:
   install:
     commands: