Adding new output attribute to aws_rds_global_cluster resource

[ppapishe]

Description

AWS Started supporting global endpoint for global aurora clusters. This PR is to basically add the new endpoint attribute as a new output attribute.

This basically solves #39862

Relations

Closes #39862

References

Output from Acceptance Testing

% make testacc TESTS=TestAccXXX PKG=ec2

...

[github-actions]

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[github-actions]

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[github-actions]

Welcome @ppapishe 👋

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