r/lambda_function: add ResourceConflictException error handling on create and update

[anGie44]

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Continues the work in #10049
Relates #5154

Output from acceptance testing:

--- PASS: TestAccLambdaFunction_basic (35.99s)
--- PASS: TestAccLambdaFunction_vpc (1575.70s)
--- PASS: TestAccLambdaFunction_disappears (206.83s)

[github-actions]

This functionality has been released in v4.8.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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