Update the iconography used in the status strip in connection settings

We're introducing a new pair of icons (regular and broken) representing Tor Browser's connection state in #41608 (closed). In addition to updating the browser chrome, there are a small number of changes that will need made to about:preferences#connection too.

These include:

Removing the "Connect" info bars
Removing the check (✔) and warning (⚠️) icons from the Internet and Tor Network statuses
Replacing the Tor Network icon with the new torconnect icons (regular when connected, and broken when not)

We could also use a tiny bit more padding between the connection status label and buttons, as per the design pls.

The Figma file's ready for dev handoff here: Figma link

These fixes will be ran through additional usability testing in March/April as part of ~"Sponsor 30" before they reach stable in 12.5.

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