Show Client Certificate paths

[thewheat]

Closes: #2300

• Creates a new div that lists one file per line with some padding to help indicate line is grouped to upper row
• There is an extra gap between the lines that I'm not sure how to get rid (not to familiar with flex box 😅 but a negative margin seems to be a possible option)
• Happy for any other comments or feedback especially in terms of how we'd want to display this 👍

Before

After

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[CLAassistant]

All committers have signed the CLA.

[dimitropoulos]

I updated to do a few things:

• no duplication anymore (i.e. the thing with the checkbox as well as a row with the path)
• network hierarchy is represented now (see https://github.com/Kong/insomnia/blob/develop/packages/insomnia-app/app/network/network.ts#L547, but basically if there's a cert and a pfx, the pfx will win and the UI will now represent that).
• optional fields are not represented (e.g. passphrase, key)
• the passphrase is not now always visible in a tooltip, but instead is in a password viewer eyeball thingy (that respects the global setting for password reveal!)

[gatzjames]

💯