chore: simplify mta.yaml

[lisajulia]

Fix and Simplify mta.yaml Configurations for Sidecar Projects

This PR makes small but important corrections to the mta.yaml files for both the java-bookshop and node-bookshop sidecar test projects.

Changes in tests/sidecar-projects/java-bookshop/mta.yaml:

• Simplified the HANA build step by replacing multiple commands (build, cleanup, directory creation, file copying) with a single command using --dest gen/db flag:

  - npx --yes cds build --for hana --dest gen/db

• Updated build-result for the sidecar-db-deployer module from gen/ to gen/db to match the new output path.

Changes in tests/sidecar-projects/node-bookshop/mta.yaml:

• Fixed a copy-paste error where agent-java-bookshop-aicore was incorrectly referenced in the node-bookshop configuration — corrected to agent-node-bookshop-aicore in both the module requires section and the resources definition.
• Minor indentation/formatting fixes.

Category: 🐛 Bug Fix / 🔧 Chore

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