Fix ATT&CK report bug: showed a different technique's results under a technique if the PBA behind them was the same

[shreyamalviya]

What does this PR do?

Fixes #1480 and fixes #1511

PR Checklist

• Have you added an explanation of what your changes do and why you'd like to include them?
• Is the TravisCI build passing?
• Was the CHANGELOG.md updated to reflect the changes?
• Was the documentation framework updated to reflect the changes?

Testing Checklist

• Added relevant unit tests?
• Have you successfully tested your changes locally? Elaborate:

  Tested by running the Island.

• If applicable, add screenshots or log transcripts of the feature working

[codecov]

Codecov Report

Merging #1514 (5be841d) into develop (e80662f) will increase coverage by 0.00%.
The diff coverage is 50.00%.

@@ Coverage Diff @@ ## develop #1514 +/- ## ======================================== Coverage 42.99% 42.99% ======================================== Files 477 477 Lines 14173 14170 -3 ======================================== - Hits 6094 6093 -1  + Misses 8079 8077 -2 

Impacted Files	Coverage Δ
...land/cc/services/attack/technique_reports/T1146.py	100.00% <ø> (+9.09%)	⬆️
...land/cc/services/attack/technique_reports/T1156.py	100.00% <ø> (+9.09%)	⬆️
...land/cc/services/attack/technique_reports/T1504.py	100.00% <ø> (+9.09%)	⬆️
...services/attack/technique_reports/pba_technique.py	44.00% <0.00%> (ø)
...ey/infection_monkey/telemetry/post_breach_telem.py	65.21% <66.66%> (+0.21%)	⬆️

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[mssalvatore]

Suggested change

	- ATT&CK report bug that showed a different technique's results under a technique if the PBA behind
	- ATT&CK report bug that showed a different techniques' results under a technique if the PBA behind

[shreyamalviya]

After 5be841d:

For PBAs with multiple entries in results:

And for PBAs with a single entry in results:

[ilija-lazoroski]

Tested and works. Nicely done.

And #1511