Update dev container configuration

[chrsamp]

Resolves SBCQ-245 and fixes issues creating local dev containers.

• Remove deprecated keys from devcontainer.json
• Remove deprecated version key from docker-compose.yml
• Fix postCreateCommand.sh to only log output from stderr
• Do not run dependency install tasks in parallel
• Update package.json on both frontend and appointment-frontend to run npm-force-resolutions without input
• Add local config files to postCreateCommand.sh
• Add dev Keycloak configuration
• Update documentation

[chrsamp]

The latest commits update postCreateCommand.sh to check whether a user IDIR already exists when bootstrapping the local database. I've also bumped the base container version to 3.8-bullseye, which adds arm64 support and removed the default JRE install in favour of the JRE bundled with the SonarLint extension (the default JRE was < v17, which doesn't work with the extension anyway).

Part of my rationale for this PR is to allow us to have a reproducible development environment, so if we did run into issues (for example, with permissions), we could simply destroy the containers used and rebuild them.

[sonarqubecloud[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