Support full image specification of dockerized integrated-devnet

[FabijanC]

Usage related changes

• Partly address Integrate devnet-rs #405
• starknet-devnet-rs can be specified by providing the full image name + tag

Development related changes

N/A

Checklist:

• Formatted the code
• No linter errors + tried to avoid introducing linter warnings
• Performed a self-review of the code
• Rebased to the last commit of the target branch (or merged it into my branch)
• Documented the changes
• Updated the test directory (with a test case consisting of network.json, hardhat.config.ts, check.ts)
• Linked issues which this PR resolves
• All tests are passing (for external contributors who don't have access to the CI/CD pipeline)

[penovicp]

Minor issue in the docs, lgtm.