Small wireless configuration fixes

[teclator]

Problem

• https://trello.com/c/5PjJQ2Vq

There are various issues detected when working on this PBI:

1. The authentication method is not selected properly
2. The form reports that auhentication failed when it is already connected.
3. Some times the labels and buttons for the selected wifi does not correspond whith the current state.
4. After a sync with master branch the backend started failing when reading wireless connections

Solution

We have fixes some of the issues but the handle of state is quite fragile and coupled to the websockets notification in the frontend and the UI therefore we plan to do some changes in the UI (Drawer and selection of the WiFi) as well as in the backend trying to store the authentication state there being able to request the state from the backend without lostling any information in case of not subscribed to changes.

About the fixes in particular:

1. The authentication method is recognized again (removed method probably by error).
2. In case that a wireless device is activated the needAuth is also removed from the cached queries
3. To be better handled.
4. Get some of the wireless settings as optional (band, channel, bssid, hidden, pmf)

...

Testing

• Tested manually

[coveralls]

Pull Request Test Coverage Report for Build 11838142890

Details

• 8 of 8 (100.0%) changed or added relevant lines in 1 file are covered.
• 433 unchanged lines in 21 files lost coverage.
• Overall coverage increased (+0.05%) to 71.375%

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Files with Coverage Reduction	New Missed Lines	%
rust/agama-lib/src/network/settings.rs	2	62.5%
rust/agama-lib/src/storage/settings.rs	2	0.0%
rust/agama-lib/src/lib.rs	5	31.25%
rust/agama-lib/src/scripts/model.rs	5	86.11%
rust/agama-server/src/web/docs/l10n.rs	6	0.0%
rust/agama-server/src/web/docs/manager.rs	6	0.0%
rust/agama-server/src/web/docs/misc.rs	6	0.0%
rust/agama-server/src/web/docs/questions.rs	6	0.0%
rust/agama-server/src/web/docs/software.rs	6	0.0%
rust/agama-server/src/web/docs/storage.rs	6	0.0%

Totals
Change from base Build 11831842629:	0.05%
Covered Lines:	16898
Relevant Lines:	23675

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💛 - Coveralls

[imobachgs]

Not for this PR, but I guess we could implement TryFrom<Value<'a>> and get rid of the if block.