Add HTTP timeouts on endpoint POST and binary GET

Net::HTTP defaults to 60s open + 60s read. A hung
local.browserstack.com or CDN can stall the binary download for
multiple minutes before the user sees an error.

- fetch_download_source_url.rb: open_timeout=10, read_timeout=15
  (small JSON response, fast)
- localbinary.rb download_to: open_timeout=10, read_timeout=30
  (read_timeout bounds per-read stalls, not total transfer)

Code review finding from LOC-6563 review.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: yashdsaraf

lib/browserstack/fetch_download_source_url.rb

@@ -25,6 +25,8 @@ def self.call(auth_token:, user_agent:, fallback: false, error_message: nil,
       http = http_class.new(uri.host, uri.port)
       http.use_ssl = true
       http.verify_mode = OpenSSL::SSL::VERIFY_PEER
+      http.open_timeout = 10
+      http.read_timeout = 15
 
       req = Net::HTTP::Post.new(uri.request_uri)
       req['Content-Type'] = 'application/json'

lib/browserstack/localbinary.rb

@@ -119,6 +119,8 @@ def download_to(url, bin_path)
     http = http_class.new(uri.host, uri.port)
     http.use_ssl = (uri.scheme == 'https')
     http.verify_mode = OpenSSL::SSL::VERIFY_PEER
+    http.open_timeout = 10
+    http.read_timeout = 30
 
     req = Net::HTTP::Get.new(uri.request_uri)
     req['User-Agent'] = @user_agent