Complete remaining after merging 17843 PR

[skabashnyuk]

Is your task related to a problem? Please describe.

There are some remaining that is left after merging #17843. They are described in description of that PR.

Describe the solution you'd like

• update CascadeRemovalTest, add userdevfiles cascade removal
• REST API to get by namespace @path("/namespace/{namespace:.*}")
• Replace get by ID with get by composite key @path("/{key:.*}"). Composite key can be just devfile ID or in the namespace:devfile_name form, where namespace is optional (e.g :devfile_name is valid key too. namespace/devfile_name form, where namespace can contain '/' character.
• Add query parameter name that allows defining the name of user devfile when creating from yaml see REST APIs that allows saving/edit/delete/search/share devfiles #17843 (comment)

Describe alternatives you've considered

n/a

Additional context

n/a

[che-bot]

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