snippets: add snippet for TestMain

[pofl]

This is a natural extension of the existing test/benchmark functions snippets (tf, bf).

Update #160

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[pofl]

I don't care about all that bureaucracy. If you want, anyone reading this can take my contribution and resubmit it as theirs.

[pofl]

@googlebot I signed it!

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This PR (HEAD: 3c1f73d) has been imported to Gerrit for code review.

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[pofl]

I understand that you want to move snippets to gopls. But until you tackle that plan, would you maybe accept this PR? The snippet can later still be migrated. If you prefer, I could also change the snippet from triggering on tm to triggering on testmain so that it is suggested in less inappropriate cases.

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Message from Hyang-Ah Hana Kim:

Patch Set 2: Code-Review+2 Trust+1

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Message from Suzy Mueller:

Patch Set 2: Trust+1

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This PR is being closed because golang.org/cl/254497 has been merged.