fix: env add/remove, fix imports

[jhockett]

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

[codecov]

Codecov Report

Merging #5903 (d85a6dc) into backendManager (81fd4d9) will not change coverage.
The diff coverage is n/a.

@@               Coverage Diff                @@
##           backendManager    #5903    +/-   ##
================================================
  Coverage           58.13%   58.13%            
================================================
  Files                 407      407            
  Lines               18768    18768            
  Branches             3556     3751   +195     
================================================
  Hits                10910    10910            
+ Misses               7196     7176    -20     
- Partials              662      682    +20     

Impacted Files	Coverage Δ
packages/amplify-util-mock/src/api/api.ts	0.00% <0.00%> (ø)
packages/graphql-mapping-template/src/print.ts	35.29% <0.00%> (ø)
packages/amplify-util-mock/src/storage/storage.ts	0.00% <0.00%> (ø)
...ges/amplify-util-mock/src/CFNParser/stack/index.ts	0.00% <0.00%> (ø)
...es/amplify-util-mock/src/api/resolver-overrides.ts	0.00% <0.00%> (ø)
...es/graphql-transformer-core/src/stripDirectives.ts	35.29% <0.00%> (ø)
.../amplify-cli-core/src/state-manager/pathManager.ts	67.07% <0.00%> (ø)
.../amplify-util-mock/src/utils/lambda/loadMinimal.ts	0.00% <0.00%> (ø)
...graphql-transformer-core/src/TransformerContext.ts	25.09% <0.00%> (ø)
...mplify-appsync-simulator/src/resolvers/function.ts	15.38% <0.00%> (ø)
... and 9 more

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[github-actions]

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