reformat add proxy support commit

[mansfieldj3]

This change enables users to configure proxy settings directly in Snowflake connections via extra parameters instead of relying solely on system environment variables, providing better isolation and control.

What changes:

• Add proxy_host, proxy_port, proxy_user, and proxy_password fields to SnowflakeHook connection configuration
• Proxy parameters are extracted from connection extras and passed to snowflake.connector.connect()
• UI fields added for proxy configuration in connection form
• Support for both modern field names and backcompat prefixes

Why:

• Enables team-specific proxy configurations without affecting system-wide settings
• Prevents unintended proxy usage from environment variables
• Provides more granular control over network routing per connection

Tests:

• test_get_conn_params_with_proxy_host_only
• test_get_conn_params_with_proxy_host_and_port
• test_get_conn_params_with_proxy_port_as_int
• test_get_conn_params_with_proxy_full_config
• test_get_conn_params_with_proxy_backcompat_prefix
• test_get_conn_with_proxy_should_call_connect

Closes: #59078

[mansfieldj3]

Reformatting of previous merge which was closed without being added

[mansfieldj3]

New merge request should resolve previous static errors and issue with using conn_params = hook._get_conn_params not conn_params = hook._get_conn_params()

[mansfieldj3]

somehow managed to only delete one of two trailing spaces on line 439 :|

[mansfieldj3]

@potiuk can you review out this request when you get the chance? Reasonably simple change to add proxy support to the snowflake hook but if you have any suggestions let me know