kdumpctl: Add get-default-crashkernel command to help list

[licliu]

get-default-crashkernel is shown in documentation but not in kdumpctl --help, include this command in the help.

Resolves: RHEL-145107

[gemini-code-assist]

Summary of Changes

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This pull request addresses an inconsistency where the get-default-crashkernel command was documented but not listed in the kdumpctl --help output. By including this command in the help message, it improves the discoverability and usability of the kdumpctl utility for users.

Highlights

• Help message update: The get-default-crashkernel command has been added to the usage message displayed by kdumpctl --help, ensuring consistency with documentation.

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[gemini-code-assist]

Code Review

The pull request successfully adds the get-default-crashkernel command to the kdumpctl --help output, aligning the help message with the available functionality. The change is straightforward and correctly implemented.