SEAB-6200: hide blank metrics rows

[hyunnaye]

Description
This PR only adds rows in the Execution Metrics section if there are data present.

Before Fix:

After Fix:

Review Instructions
Go to https://staging.dockstore.org/workflows/github.com/gatk-workflows/seq-format-conversion/BAM-to-Unmapped-BAM:3.0.0?tab=metrics and verify that the empty CPU, Memory, Cost rows are not shown.

Issue
https://ucsc-cgl.atlassian.net/browse/SEAB-6200

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!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b10b581) 40.44% compared to head (b10b581) 40.44%.

❗ Current head b10b581 differs from pull request most recent head 72dc195. Consider uploading reports for the commit 72dc195 to get more accurate results

Additional details and impacted files

@@               Coverage Diff               @@
##           release/2.12.0    #1927   +/-   ##
===============================================
  Coverage           40.44%   40.44%           
===============================================
  Files                 369      369           
  Lines               11489    11489           
  Branches             2944     2944           
===============================================
  Hits                 4647     4647           
  Misses               4506     4506           
  Partials             2336     2336           

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[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
12.5% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud