Add Support for storing logs to Google Cloud Storage

[khrm]

Changes

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Release Notes

Add Support for storing logs to Google Cloud Storage. Set LogType to "GCS",
pass `GOOGLE_APPLICATION_CREDENTIALS` environment variable  and attach 
the file in the location pointed by `GOOGLE_APPLICATION_CREDENTIALS` variable.

[khrm]

/assign @enarha @sayan-biswas

[tekton-robot]

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[enarha]

/lgtm