[Nitro CLI] Respect NITRO_CLOUD_URL environment variable

[tobias-tengler]

No description provided.

[Copilot]

Pull request overview

Adjusts the Nitro CLI so the NITRO_CLOUD_URL environment variable is respected for the --cloud-url option, taking precedence over the session URL (but not over an explicit --cloud-url argument). Previously the option's default was hard-coded to Constants.ApiUrl, which meant the session URL was always preferred over the env var.

Changes:

• Remove the hard-coded default value from OptionalCloudUrlOption, relying on NitroClientContext.Configure to fall back to Constants.ApiUrl when no URL is provided.
• Simplify ConfigureClientContext to use the option's resolved value (explicit arg or env var) and only fall back to the session URL when it's empty.
• Update help-text snapshots across all command tests (remove [default: api.chillicream.com]) and add new GlobalOptionsTests cases covering the new precedence rules.

Reviewed changes

Copilot reviewed 66 out of 66 changed files in this pull request and generated no comments.

File	Description
src/Nitro/CommandLine/src/CommandLine/Options/OptionalCloudUrlOption.cs	Drop hard-coded default so env var isn't masked.
src/Nitro/CommandLine/src/CommandLine/Extensions/RootCommandExtensions.cs	Simplified URL resolution preferring option value (explicit/env) over session.
src/Nitro/CommandLine/test/CommandLine.Tests/GlobalOptionsTests.cs	New tests covering env vs session vs explicit --cloud-url precedence.
src/Nitro/CommandLine/test/CommandLine.Tests/Commands/**/*.cs	Updated help-text snapshots to drop [default: api.chillicream.com].

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