chore: update the DryRunService to improve error messages

[viictoo]

• Added logic to differentiate between variants within the same integration and scripts across different integrations, prompting users to specify the correct variant or integration ID as needed.

EXT-610

Open Issues Will require validation and additional testing for variants

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This PR enhances error messaging in the CLI's DryRunService by differentiating between script variants within the same integration versus scripts across different integrations. When a script name conflict is detected, users now receive more specific guidance on whether to use '--variant' or '--integration-id' flags.

This summary was automatically generated by @propel-code-bot

[linear[bot]]

EXT-610 Improve dryrun error messaging

[cubic-dev-ai[bot]]

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