Clean up older calls for s3 files

[manasaV3]

Cleaning up metrics s3 files

• data-workflows maintenance data fetch cleanup #1148
• Validate maintenance dynamo data to be consistent with s3 data
• Remove the dynamo feature flag for maintenance #1178
• Validate no calls made to s3 for activity data
• Remove backend workflow write to s3 for activity #1179
• Remove backend activity workflow completion metrics and alarm #1180

Cleaning up plugins s3 files

• Remove the dynamo feature flag for the plugin endpoints #1191
• Validate no calls made to s3 for plugin data
• Remove backend workflow writes to s3 for plugin data #1192
• Remove backend plugin workflow completion metrics and alarm #1193

[manasaV3]

Relates to #845, #1131

[richaagarwal]

@manasaV3 Linking to this older comment you wrote in case it's helpful to track in this ticket: #845 (comment)

[richaagarwal]

Removing the epic label so that we can see this in our sprint board, but we can still track the parent epic in our roadmap board 🚀

[manasaV3]

Validation for S3 files are no longer being used other than during the plugin update workflow:

From the datadog traces here we can see all the s3.getObject calls made are as a part of the backend plugin update workflow in staging during a period of 4 days.