Declare missing conda parameter in deploy_steps_v2 template

[Manya Sharma (ManyaS-Git)]

Summary

.ci/steps/deploy_steps_v2.yml references ${{parameters.conda}} in two places:

• Line 40: passed to cleanuptask.yml as the conda environment name.
• Line 75: used as source activate ${{parameters.conda}} to activate the environment before installing packages and running set_secret.py.

However, conda was never declared in the template's parameters: block (lines 1-21). An undeclared parameter resolves to an empty string at compile time, so source activate runs with no environment name and fails.

The same file already hardcodes conda: deployment_aml when calling deploy_notebook_steps.yml on line 68, confirming the intended default. The fix adds the missing declaration with that value.

Verification

• YAML validates; conda now appears in the parsed parameters dict.
• Bug confirmed present on upstream microsoft/AI master.
• cleanuptask.yml accepts a conda parameter (declared with default MLAKSDeployAML) — passing the explicit value overrides it correctly.