Two JSdoc parsing fixes

[sandersn]

1. Correctly parse *=. Previously parseNonArrayType missed it because the scanner produces a single AsteriskEqualsToken for it.
2. Allow non-standard use of backticks around names in @param tags. For example:

/** @param {number} `a` some kind of number */
function f(a) { ... }

Fixes #22413

[sandersn]

The CI failure is some whitespace lint.

[weswigham]

nit: Could you add a test for var a = /* @type *= */(null) (or somewhere else we parse an unbracketed jsdoc type, if I'm misremembering and we never allowed that), just so we know it doesn't crash?

[sandersn]

Good idea, since we went to make sure that we're getting tokens from the main scanner instead of the jsdoc one. Done.