chore: remove deprecated Mobile service

[ianbotsf]

Issue \

(none)

Description of changes

This change removes the now-deprecated client for the AWS Mobile service, which has since been replaced by Amplify.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[github-actions[bot]]

A new generated diff is ready to view.

• No codegen difference in the AWS SDK

[github-actions[bot]]

Affected Artifacts

Changed in size

| Artifact |Pull Request (bytes) | Latest Release (bytes) | Delta (bytes) | Delta (percentage) | | -------- | ------------------: | ---------------------: | ------------: | -----------------: | |mobile-jvm.jar|(does not exist)|390,244|-390,244|-100.00%| |mobile-jvm.jar closure|(does not exist)|8,618,913|-8,618,913|-100.00%|