feat: accept pool name as positional arg in browser-pools create

[tnsardesai]

Summary

Allow kernel browser-pools create my-pool as shorthand for kernel browser-pools create --name my-pool. The --name flag still works for backward compatibility. added this because I forget to add --name

Testing

Previously we created the pool and ignored the passed name

❯ kernel browser-pools create test --size 1
 SUCCESS  Created browser pool a8e4g5n4doawmwwy7dip8qqz

Now we are creating the pool and the name is set. --name still works

❯ ./bin/kernel browser-pools create test --size 1
 SUCCESS  Created browser pool test (pctp2h92siimy4jxks89g33g)
❯ ./bin/kernel browser-pools create --name test --size 1
  ERROR   Conflict: A pool with this name already exists

---

Note

Low Risk
Small CLI parsing change limited to browser-pools create; low blast radius aside from potential behavior change when both --name and a positional name are supplied.

Overview
kernel browser-pools create now accepts an optional positional [name] argument as a shorthand for --name.

The command enforces mutual exclusivity between the positional name and --name (returns an error if both are provided) and updates the Cobra command usage/arg validation accordingly.

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[Sayan-]

lgtm! pls resolve bugbot and can approve