feat: Support commit context match pattern

[dippynark]

If there are multiple CI jobs running against the same repository, poller may think that the Lighthouse job has run, when actually it was another system (e.g. Jenkins). This PR adds support for a flag to supply a regex pattern for matching the commit status context so that poller is looking for signs of the correct job.

[jenkins-x-bot]

Hi @dippynark. Thanks for your PR.

I'm waiting for a jenkins-x or todo member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[dippynark]

/assign @dgozalo

[rawlingsj]

/lgtm

[rawlingsj]

/ok-to-test

[jenkins-x-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rawlingsj

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[jenkins-x-bot]

New changes are detected. LGTM label has been removed.