Allow parsing third-party archives

[stephen-soltesz]

This change updates the etl archive path parsing regular expression so that it will match the third-party archives generated by the synthetic uuid annotation export process. The synthetic archives reuse the "machine" field (normally mlab[1-4]) and the "site" field (normally [a-z]{3}\d[0-9t]) to also match "third" and "party" respectively.

With this change, thirdparty archives copied to the public archive will be natively parseable by the etl+gardener system.

For example:

gs://archive-mlab-sandbox/ndt/annotation/2019/07/12/20211107T143543.161376Z-annotation-third-party-ndt.tgz

Tested using the local output mode.

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This change is 

[coveralls]

Pull Request Test Coverage Report for Build 6721

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.02%) to 63.809%

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Files with Coverage Reduction	New Missed Lines	%
active/active.go	2	90.63%
<!--	Total:	2		-->

Totals
Change from base Build 6707:	0.02%
Covered Lines:	3766
Relevant Lines:	5902

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💛 - Coveralls