Add successful passing rate

[coverbeck]

Description
Add a passing rate to metrics' UI.

Only passed and failed executions are used in the calculation (aborted are skipped).

Review Instructions

1. Navigate to a workflow with execution metrics
2. Go to metrics tab
3. See percentage of passing next to total passed.

Issue
SEAB-6201

Security
If there are any concerns that require extra attention from the security team, highlight them here.

Please make sure that you've checked the following before submitting your pull request. Thanks!

• Check that your code compiles by running npm run build
• Ensure that the PR targets the correct branch. Check the milestone or fix version of the ticket.
• If this is the first time you're submitting a PR or even if you just need a refresher, consider reviewing our style guide
• Do not bypass Angular sanitization (bypassSecurityTrustHtml, etc.), or justify why you need to do so
• If displaying markdown, use the markdown-wrapper component, which does extra sanitization
• Do not use cookies, although this may change in the future
• Run npm audit and ensure you are not introducing new vulnerabilities
• Do due diligence on new 3rd party libraries, checking for CVEs
• Don't allow user-uploaded images to be served from the Dockstore domain
• If this PR is for a user-facing feature, create and link a documentation ticket for this feature (usually in the same milestone as the linked issue). Style points if you create a documentation PR directly and link that instead.
• Check whether this PR disables tests. If it legitimately needs to disable a test, create a new ticket to re-enable it in a specific milestone.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (6a55fb2) 40.45% compared to head (4de6dff) 40.44%.

Files	Patch %	Lines
...pp/workflow/executions/executions-tab.component.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                 @@
##           release/2.12.0    #1929      +/-   ##
==================================================
- Coverage           40.45%   40.44%   -0.02%     
==================================================
  Files                 369      369              
  Lines               11486    11489       +3     
  Branches             2942     2944       +2     
==================================================
  Hits                 4647     4647              
- Misses               4503     4506       +3     
  Partials             2336     2336              

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