Add Helm 4 support to the `Deploy a Helm Chart` step

[hnrkndrssn]

Prerequisites

• I have searched open and closed issues to make sure it isn't already requested
• My team has started working on this issue
• I have written a descriptive issue title

The enhancement

The Need

Helm released major version 4, and our Deploy a Helm Chart step doesn't support it yet.

The step calls helm version --client --short to check the Helm CLI version. Helm 4 removed the --client flag, so the command fails outright when Helm 4 is installed. On top of that, our version parser only recognizes Helm 2 and Helm 3, so even after working around the flag issue, Helm 4 gets flagged as an unparseable version.

Solution

Update the Deploy a Helm Chart step so it works with Helm 4:

• Drop the --client flag from the Helm version check, since helm version --short works on both Helm 3 and Helm 4.
• Recognize any Helm major version 3 or later as supported, instead of only recognizing Helm 3. This means future Helm releases keep working without more changes on our end.

With this fix, you can use the Deploy a Helm Chart step with Helm 3 or Helm 4, with no warnings.