[google_workspace] Remove redundant event.ingested

[andrewkroh]

What does this PR do?

event.ingested is added by a Fleet final_pipeline so these additions were redundant.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[elasticmachine]

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Build stats

• Start Time: 2022-03-09T14:50:15.973+0000

• Duration: 18 min 14 sec

Test stats 🧪

Test	Results
Failed	0
Passed	45
Skipped	0
Total	45

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