add evaluation delay to custom monitors using metrics from aws

[annamontare-nava]

JIRA Ticket:
n/a

What Does This PR Do?

Adds the Datadog-recommended evaluation delay to AWS metrics.

These changes have already been applied.

What Should Reviewers Watch For?

If you're reviewing this PR, please check for these things in particular:

• Any monitors that shouldn't have this delay?

Validation

These changes have been validated through applying them.

What Security Implications Does This PR Have?

Please indicate if this PR does any of the following:

• Adds any new software dependencies
• Modifies any security controls
• Adds new transmission or storage of data
• Any other changes that could possibly affect security?

• Yes, one or more of the above security implications apply. This PR must not be merged without the ISSO or team
  security engineer's approval.

Any Migrations?

• Yes, there are migrations
  • The migrations should be run PRIOR to the code being deployed
  • The migrations should be run AFTER the code is deployed
  • There is a more complicated migration plan (downtime,
    etc)
• No migrations