Local statistics connectivity (EXPOSUREAPP-8436)

[BMItr]

This PR addresses Exposureapp-8436.
[Android] Statistics behavior when offline during onboarding.

How to test:

• visit statistic cards on the MainFragment
• check that its prevented to add a new card without internet connection (by notification or addView hiding)
• check if the addCard Element reappears after switching Internet/Wifi on
  (if there is no cached data or internet connection, statistic data should not be shown)

Note: MERGE AFTER #3767 (done)

Screenshots:

No Internet Case:

• regular AddCard Item should not be visible (greyed out with explaining text)
  

with internet:

[NataliaLemmerth]

UA approved.

[ChristinaTsigganos]

please take over UA text

[BMItr]

please take over UA text

all right.
LayoutAdjustment needed for longer texts. in progress... (adjusted. Screenshot updated in the description)

[fynngodau]

Two things are not entirely addressed by this PR so far:

• When the internet connection is disabled while the selection is open, the user can still finish adding the card with the same behavior as in Bad behavior when adding local incidence without network access cwa-documentation#672.
  This could happen for example in a situation where the system thinks that the network is available, but requests are never answered and time out.
• After toggling a network connection, the statistics cards jump to the default position (first card after the "add card card").

[BMItr]

Two things are not entirely addressed by this PR so far:

• When the internet connection is disabled while the selection is open, the user can still finish adding the card with the same behavior as in Bad behavior when adding local incidence without network access cwa-documentation#672.
  This could happen for example in a situation where the system thinks that the network is available, but requests are never answered and time out.
• After toggling a network connection, the statistics cards jump to the default position (first card after the "add card card").

it could also be that an asteriod hits the user during adding a card. This case is also not handled.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

36.4% Coverage
0.0% Duplication

[vaubaehn]

I didn't have problems with asteroids so far, but

This could happen for example in a situation where the system thinks that the network is available, but requests are never answered and time out.

is a situation that I'm often experiencing. And probably not me alone.
Sure, not everything needs to be pressed into one PR, but at least it's worth to think about.

[ChristinaTsigganos]

UA approved

[BMItr]

I didn't have problems with asteroids so far, but

This could happen for example in a situation where the system thinks that the network is available, but requests are never answered and time out.

is a situation that I'm often experiencing. And probably not me alone.
Sure, not everything needs to be pressed into one PR, but at least it's worth to think about.

@vaubaehn @fynngodau
Yes. You are right on this.
Follow Up PR will come (I already prepared something about the jumping card issue, and maybe I have somehting for the in-between-no-internet-case).
For now I cannot pack more cases in this ticket (as requested) regarding other tickets...
Greetz 👌