feat: Extend BashJobRunner CodeBuild Project props.

[daveroberts-aws]

Issue # (if applicable)

Closes #.

Reason for this change

1. There's no way to change the CodeBuild Project properties in BashJobRunner. (For example, adding a source, or changing the compute type or build image).

2. Contributing.md didn't specify to install dependencies in the point-solutions, leading to a test failing.

Description of changes

1. Added an optional property to BashJobRunnerProps which expands in the Project props if present.

Description of how you validated changes

1. Added extra properties to the integration test for the core app.

Checklist

• [ x ] My code adheres to the CONTRIBUTING GUIDE
• [ x ] I have updated the relevant documentation (if applicable).

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[suhussai]

I like the idea, but one concern I have is with regards to props.scriptEnvironmentVariables. With this new change, we'll have 2 parameters that can be used to set the env vars available in the codebuild project.

IMO, it would be better for us to reduce that to 1 by either:

• removing props.scriptEnvironmentVariables
• removing codeBuildProps and adding two new args: one for buildImage and one for computeType