fix cache-control response header honoring for browser cache endpoint and immutable honoring for Pro CDN

[necipallef]

Bug: There is a problem with the browser cache endpoint's response. The Cache-Control header is not propagated as-is to the browser. It should be Cache-Control: max-age=31534000, immutable, private but it is Cache-Control: max-age=0, no-cache, no-store, and also the response has Pragma: no-cache which shouldn't have.

The solution has two steps:

• Use "caching" behavior on the browser cache endpoint rule, just like Pro CDN. This fixes the problem with Pragma header. This also fixes the problem with max-age and private, but immutable flag is still missing.
• Use "downstreamCache" behavior in the browser cache endpoint rule. This fixes the problem with immutable flag. Add this behavior also to the ProCDN rule since it may be needed in the future.

[github-actions]

This PR will create a patch release 🚀

1.0.2 (2023-10-30)

Bug Fixes

• browserCacheEndpointCache: fix cache-control response header honoring (971a2cd)
• browserCacheEndpointCache: fix cache-control response header immmutable flag (0feacfd)