Commit Message: support backoff between retries in tcp_proxy
Additional Description: This feature also fixes a bug in the retry mechanism in tcp proxy in the following situation:

1. We are tunneling TCP over HTTP.
2. A new stream is created on existing upstream connection (multiplexing) and waiting for response headers.
3. The upstream connection is closed.
4. During the close process, all streams created on this connection will be reset.
5. The tcp_proxy receives a callback on the stream reset.
6. They retry to connect.
7. The closed connection is picked as it is still in the connection pool (we are still in the process of the close).
8. The new stream that is created on the second attempt will be reset immediately.
9. The same process will happen (step 5 - step 8) until we reach the max_connect_attepts.
10. This means that we are doing only one real attempt in this situation.

Risk Level: medium
Testing: unit tests, integration tests
Docs Changes: added
Release Notes: added

Request variables

Key	Value
ref	7d51868
sha	96ef8db
pr	37709
base-sha	3a56fed
actor	@IssaAbuKalbein
message	support backoff between retries in tcp_proxy...
started	1736411430.29081
target-branch	main
trusted	false

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