fix: make file marks behave properly (doublestar glob or regex , no weird glob-to-regex behavior)

[gabyx]

Describe the problem/challenge you have

Filemarks paths like **/*/output:type=data get internally replaced to a regex .+/output which lead to bogus unintuitive bugs.
Also **/*/output/**/*/a does not work as the replacement is single only (why is questionable)?

https://github.com/carvel-dev/ytt/blob/develop/pkg/cmd/template/file_marks.go#L131

Describe the solution you'd like

• Use the library https://github.com/bmatcuk/doublestar#match
  where one has sane glob behavior with **/output/a/**/a etc..

• Or do only support regexes and do not mix them. I would say it confuses usage and is not a nice behavior.

• Or less recommended: support using **/* multiple times (strings.ReplaceAll). But going the road of doing some weird globbing (**/* cannot represent ** glob which can match nothing) is not gonna help the long term.

Anything else you would like to add:

Going the doublestar way, I can implement this in a PR.

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