Add job filter to prometheus alert

[v-zhuravlev]

up metric is ubiquitous prometheus metric, created from any prometheus scrape, so having alert up==0 would fire on any scrape, even unrelated to Harvest.

This PR adds additional job filter that should ignore problems with unrelated scrapes.

[cla-bot]

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[v-zhuravlev]

@cla-bot check

[cla-bot]

Thank you for your interest in contributing to the Harvest project! We require contributors to sign our Corporate contributor license agreement (CCLA), and we don"t have the user(s) @v-zhuravlev on file. In order for us to review and merge your code, please follow the instructions in step 6 of creating a pull request.
After signing the CCLA, you can ask us to recheck this PR by posting @cla-bot check as a comment to the PR.

[cla-bot]

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