Add support for concurrency cross channel behaviour

[its2shar]

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

Add cross-channel behavior support to aws_connect_routing_profile resource and data source

Relations

Closes #35018

References

https://docs.aws.amazon.com/connect/latest/APIReference/API_CreateRoutingProfile.html
https://docs.aws.amazon.com/connect/latest/APIReference/API_UpdateRoutingProfileConcurrency.html

Output from Acceptance Testing

% make t K=connect T=TestAccConnect_serial/RoutingProfile/crossChannelBehavior
make: Verifying source code with gofmt...
==> Checking that code complies with gofmt requirements...
make: Running acceptance tests on branch: 🌿 r/aws_connect_routing_profile 🌿...
TF_ACC=1 go1.24.8 test ./internal/service/connect/... -v -count 1 -parallel 20 -run='TestAccConnect_serial/RoutingProfile/crossChannelBehavior'  -timeout 360m -vet=off
2025/10/21 19:08:59 Creating Terraform AWS Provider (SDKv2-style)...
2025/10/21 19:08:59 Initializing Terraform AWS Provider (SDKv2-style)...
=== RUN   TestAccConnect_serial
=== PAUSE TestAccConnect_serial
=== CONT  TestAccConnect_serial
=== RUN   TestAccConnect_serial/RoutingProfile
=== RUN   TestAccConnect_serial/RoutingProfile/crossChannelBehavior
--- PASS: TestAccConnect_serial (186.41s)
    --- PASS: TestAccConnect_serial/RoutingProfile (186.41s)
        --- PASS: TestAccConnect_serial/RoutingProfile/crossChannelBehavior (186.41s)
PASS
ok      github.com/hashicorp/terraform-provider-aws/internal/service/connect    191.755s

[github-actions]

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[github-actions]

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[subham-ibmhc]

Closing this PR. I will open a fresh PR with the changes discussed.

[github-actions]

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