cache-control: no-cache: use quoted-string form (#4177)

* cache-control: no-cache: use quoted-string form

Update comment and test examples of qualified no-cache directives (no-cache=...) to use the quoted-string form instead of the token form.

Per https://httpwg.org/specs/rfc9111.html#cache-response-directive.no-cache:

> This directive uses the quoted-string form of the argument syntax. A sender SHOULD NOT generate the token form (even if quoting appears not to be needed for single-entry lists).

* revert deliberate test case

* revert some changes

---------

Co-authored-by: alxndrsn <alxndrsn>

Author: alxndrsn

lib/util/cache.js

@@ -234,7 +234,7 @@ function parseCacheControlHeader (header) {
               }
             }
           } else {
-            // Something like `no-cache=some-header`
+            // Something like `no-cache="some-header"`
             if (key in output) {
               output[key] = output[key].concat(value)
             } else {