Detect BitBucket CI pipeline re-run better

[bahmutov]

When a BitBucket CI pipeline fails, the user can retry just the failed steps. This does NOT create a new pipeline, instead it increments the environment variable BITBUCKET_STEP_RUN_NUMBER see https://community.atlassian.com/t5/Bitbucket-questions/About-the-BITBUCKET-STEP-RUN-NUMBER-Default-Variable/qaq-p/1319257

We need to send this variable to the Dashboard API when recording so we can properly assign the recordings

[cypress-bot]

Released in 6.1.0.

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