Handle parsing of timestamps in time.DateTime format. Fix #670

[sbocinec]

Description

Handle parsing of timestamps in time.DateTime format. Fixes #670

cloud-nuke (v0.35.0) is currently unable to parse EIPs (and possibly other resources) that are tagged with cloud-nuke-first-seen containing non-RFC3339 timestamp as you can see here:

This leads to the EIP not being deleted due to the following error:

 ERROR   Unable to retrieve eip, parsing time "2023-12-19 10:34:26" as "2006-01-02T15:04:05Z07:00": cannot parse " 10:34:26" as "T"

TODOs

Read the Gruntwork contribution guidelines.

• Update the docs.
• Run the relevant tests successfully, including pre-commit checks.
• Ensure any 3rd party code adheres with our license policy or delete this line if its not applicable.
• Include release notes. If this PR is backward incompatible, include a migration guide.
• Attention Grunts - if this PR adds support for a new resource, ensure the nuke_sandbox and nuke_phxdevops jobs in .circleci/config.yml have been updated with appropriate exclusions (either directly in the job or via the .circleci/nuke_config.yml file) to prevent nuking IAM roles, groups, resources, etc that are important for the test accounts.

Release Notes (draft)

Fixed parsing of FirstSeenTag in non-RFC3339 format to fix EIP nuke

Migration Guide

[james03160927]

LGTM. Let me trigger the test pipeline

[james03160927]

LGTM