chore: disable gcov & codecov fine tune

[SanketD92]

Issue #, if available:
GALI-802

Description of changes:
Run CodeCov only against PRs. Drop threshold set to 0.1%

Checklist:

• Have you successfully deployed to an AWS account with your changes?
• Have you written new tests for your core changes, as applicable?
• Have you successfully tested with your changes locally?
• Have you updated openapi.yaml if you made updates to API definition (including add, delete or update parameter and request data schema)?
• If you had to run manual tests, have you considered automating those tests by adding them to end-to-end tests?

AS review ticket id:

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

[codecov-commenter]

Codecov Report

Merging #460 (43f8d6d) into develop (03afe0e) will increase coverage by 1.04%.
The diff coverage is n/a.

❗ Current head 43f8d6d differs from pull request most recent head b64295a. Consider uploading reports for the commit b64295a to get more accurate results

@@             Coverage Diff             @@
##           develop     #460      +/-   ##
===========================================
+ Coverage    48.76%   49.81%   +1.04%     
===========================================
  Files          493      242     -251     
  Lines        22909    10297   -12612     
  Branches      3457     1438    -2019     
===========================================
- Hits         11171     5129    -6042     
+ Misses       10097     4351    -5746     
+ Partials      1641      817     -824     

Impacted Files	Coverage Δ
...e-raas-ui/src/models/forms/CreateAwsAccountForm.js
...raas-services/lib/user/helpers/user-authz-utils.js
...aas-ui/packages/base-raas-ui/src/helpers/crypto.js
...kages/base-raas-ui/src/helpers/externalCostUtil.js
...-raas-ui/packages/base-raas-ui/src/helpers/form.js
...base-ui/src/models/constants/local-storage-keys.js
...ges/base-raas-ui/src/models/aws-accounts/Budget.js
...mbdas/authentication-layer-handler/handler-impl.js
...ment/lib/steps/create-service-catalog-portfolio.js
...service-catalog/environment-config-vars-service.js
... and 241 more

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