fix: validate workspace name

[keita-determined]

Description

WEB-746

Test Plan

• Go to workspace
• Check if Creating/Editing a workspace with an all whitespaced name like on webUI modal causes validation errors
• Check if Creating/Editing a workspace with an all whitespaced name though API causes errors

Commentary (optional)

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

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[ClaireNeveu]

If we really want to restrict workspace names this way then we should be accounting for all whitespace characters. There is a unicode utility to do this.

[ioga]

probably something like this should trim both common whitespace and unicode separators:

var whitespaceText = regexp.MustCompile("[\\pZ[:space:]]")

func main() {
	s := "Hello, p\tl\naygr ou\u2028n\u00a0d"
	fmt.Println(whitespaceText.ReplaceAllLiteralString(s, ""))
}

[keita-determined]

i think we just wanna trim leading and trailing whitespaces to accept names like Hello World or test v1, so i made it like this

len(strings.TrimFunc(name, unicode.IsSpace)) == 0

[ioga]

okay, that should work. I did not realize we want to trim these spaces (what if user really wants to have them there). if we do, perhaps we'd want to do the same every time we parse workspace names in other APIs, e.g. in the experiment config on experiment submission.

[keita-determined]

i see. then beckend just checks if the name isnt whitespace-only, and dont trim whitespace if there are at least 1 non-whitespace.

[gt2345]

Works as described, but do make sure the exact rules we want to follow before merging.

[julian-determined-ai]

Left minor formatting suggestions but otherwise great work!