ci: Remove duplicate step

[akash1810]

What does this change?

Remove duplicate invocation of cdk build steps. The build is currently doing:

- name: CDK synth (worker lambda cdk directory)
  working-directory: cdk
  run: |
    yarn install --immutable
    yarn test
    yarn synth
- name: CDK synth (root cdk directory)
  working-directory: cdk
  run: |
    yarn install --immutable
    yarn lint
    yarn test
    yarn synth

This change removes the first block as it is redundant following #1556.

[github-actions]

Deploy build 5183 of mobile-n10n:notificationworkerlambda to CODE

All deployment options

• Deploy build 5183 of mobile-n10n:notificationworkerlambda to CODE
• Deploy parts of build 5183 to CODE by previewing it first
• What's on CODE right now?

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From guardian/actions-riff-raff.