feat(bg-custom-param-group): add parameter_group_name for blue_green_update block

[ValeriiStepanets]

Small changes to blue_green_update block.

• Added parameter_group_name to specify a custom DB param group in the time of green creation

Description

I'm working as a DevOps engineer and trying to perform a Major version upgrade using B/G deployment via Terraform.
Spotted an issue when I performed such an update - green environmet has the same param group as the blue one(with rds.logical_replication and other params that need for B/G update - but this will cause the error while replication), so I decided to add the possibility to specify custom db param group

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Description

Relations

Closes #0000

References

Output from Acceptance Testing

% make testacc TESTS=TestAccXXX PKG=ec2

...

[github-actions]

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[github-actions]

✅ Thank you for correcting the previously detected issues! The maintainers appreciate your efforts to make the review process as smooth as possible.