Milestone 1.3 (Improve line and branch coverage for the frontend and the backend): Updated run_backend_test script to calculate per-file branch coverage

[IamEzio]

Overview

1. This PR fixes or fixes part of NA.
2. This PR does the following:
   • Updated run_backend_tests script to calculate branch coverage
   • Adds remaining incompletely covered files to the exclusion list

Essential Checklist

• The PR title starts with "Fix #bugnum: ", followed by a short, clear summary of the changes. (If this PR fixes part of an issue, prefix the title with "Fix part of #bugnum: ...".)
• The linter/Karma presubmit checks have passed locally on your machine.
• "Allow edits from maintainers" is checked. (See here for instructions on how to enable it.)
  • This lets reviewers restart your CircleCI tests for you.
• The PR is made from a branch that's not called "develop".

Proof that changes are correct

NA

Proof of changes on desktop with slow/throttled network

NA

Proof of changes on mobile phone

NA

Proof of changes in Arabic language

NA

PR Pointers

• Make sure to follow the instructions for making a code change.
• If you need a review or an answer to a question, and don't have permissions to assign people, leave a comment like the following: "{{Question/comment}} @{{reviewer_username}} PTAL". Oppiabot will help assign that person for you.
• For what code owners will expect, see the Code Owner's wiki page.
• Make sure your PR follows conventions in the style guide, otherwise this will lead to review delays.
• Never force push. If you do, your PR will be closed.
• Some of the e2e tests are flaky, and can fail for reasons unrelated to your PR. We are working on fixing this, but in the meantime, if you need to restart the tests, please check the "If your build fails" wiki page.

[oppiabot]

Hi, @IamEzio, this pull request does not have a "CHANGELOG: ..." label as mentioned in the PR pointers. Assigning @IamEzio to add the required label. PRs without this label will not be merged. If you are unsure of which label to add, please ask the reviewers for guidance. Thanks!

[oppiabot]

Hi @IamEzio, the build of this PR is stale and this could result in tests failing in develop. Please update this pull request with the latest changes from develop. Thanks!

[oppiabot]

Hi @IamEzio, there is a new change in develop which needs to be in your PR. Please update your branch with the latest changes in develop. For instructions, refer to this link. Thanks!

[oppiabot]

Hi @IamEzio, there is a new change in develop which needs to be in your PR. Please update your branch with the latest changes in develop. For instructions, refer to this link. Thanks!

[oppiabot]

Hi @IamEzio, the build of this PR is stale and this could result in tests failing in develop. Please update this pull request with the latest changes from develop. Thanks!

[oppiabot]

Hi @IamEzio, there is a new change in develop which needs to be in your PR. Please update your branch with the latest changes in develop. For instructions, refer to this link. Thanks!

[oppiabot]

Hi @IamEzio. Due to recent changes in the "develop" branch, this PR now has a merge conflict. Please follow this link if you need help resolving the conflict, so that the PR can be merged. Thanks!

[oppiabot]

Hi @IamEzio, there is a new change in develop which needs to be in your PR. Please update your branch with the latest changes in develop. For instructions, refer to this link. Thanks!

[oppiabot]

Hi @IamEzio, there is a new change in develop which needs to be in your PR. Please update your branch with the latest changes in develop. For instructions, refer to this link. Thanks!

[oppiabot]

Hi @IamEzio, there is a new change in develop which needs to be in your PR. Please update your branch with the latest changes in develop. For instructions, refer to this link. Thanks!

[IamEzio]

@U8NWXD PTAL! Thanks

[oppiabot]

Unassigning @IamEzio since a re-review was requested. @IamEzio, please make sure you have addressed all review comments. Thanks!

[IamEzio]

@U8NWXD PTAL! Thanks

[oppiabot]

Unassigning @IamEzio since a re-review was requested. @IamEzio, please make sure you have addressed all review comments. Thanks!

[oppiabot]

Hi @IamEzio, there is a new change in develop which needs to be in your PR. Please update your branch with the latest changes in develop. For instructions, refer to this link. Thanks!

[IamEzio]

@U8NWXD PTAL! Thanks

[oppiabot]

Unassigning @IamEzio since a re-review was requested. @IamEzio, please make sure you have addressed all review comments. Thanks!

[oppiabot]

Unassigning @U8NWXD since they have already approved the PR.

[oppiabot]

Assigning @krishnarao22 for code owner reviews. Thanks!