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You've got the right idea and the right Linguist overrides (either will do the trick). The problem is your path matching isn't quite right.

From the .gitattributes docs

The rules by which the pattern matches paths are the same as in .gitignore files (see gitignore[5]), with a few exceptions: [...]

If we look in the .gitignore docs (emphasis is mine):

An asterisk "*" matches anything except a slash. The character "?" matches any one character except "/". The range notation, e.g. [a-zA-Z], can be used to match one of the characters in a range. See fnmatch(3) and the FNM_PATHNAME flag for a more detailed description.

Two consecutive asterisks ("**") in patterns matched against full pathname may have special meaning: [...]

• A trailing "/**" matches everything inside. For example, "abc/**" matches all files inside directory "abc", relative to the location of the .gitignore file, with infinite depth.

The files you're trying to ignore are in sub-directories of the paths you've specified so you need to either:

• use TestProject/wwwroot/lib/** linguist-vendored to recurse, or
• use TestProject/wwwroot/lib/bootstrap-icons/docs/* linguist-vendored to limit to this directory.

We can demonstrate this without even using Linguist thanks to git check-attr: