chore: remove support for old escrow invitations flow

[kathaypacific]

Description

This PR removes support for the old escrow flow, where you could send funds to the escrow contract to invite a friend (using their phone number). Specifically, the following is deleted:

• support for reclaiming sent funds. this includes the UI notification in notification center, as well as all the backend sagas and actions.
• support for showing invitations via escrow in the homefeed. it's been a long time since we removed escrow so not many users should be impacted by this change. those transactions will be omitted from the feed.

Test plan

Related issues

• Related to RET-1173

Backwards compatibility

Network scalability

If a new NetworkId and/or Network are added in the future, the changes in this PR will:

• Continue to work without code changes, OR trigger a compilation error (guaranteeing we find it when a new network is added)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.17%. Comparing base (8bb860f) to head (8bcc810).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5778      +/-   ##
==========================================
+ Coverage   86.97%   87.17%   +0.20%     
==========================================
  Files         747      733      -14     
  Lines       31771    31183     -588     
  Branches     5307     5507     +200     
==========================================
- Hits        27632    27183     -449     
+ Misses       4093     3774     -319     
- Partials       46      226     +180     

Files	Coverage Δ
src/analytics/Events.tsx	100.00% <ø> (ø)
src/analytics/Properties.tsx	100.00% <ø> (ø)
src/app/ErrorMessages.ts	100.00% <ø> (ø)
src/fees/reducer.ts	73.33% <ø> (-1.67%)	⬇️
src/fees/saga.ts	88.39% <100.00%> (-0.96%)	⬇️
src/home/NotificationBox.tsx	88.65% <ø> (+0.81%)	⬆️
src/home/NotificationCenter.tsx	97.11% <100.00%> (-0.26%)	⬇️
src/home/saga.ts	57.40% <ø> (-1.53%)	⬇️
src/home/types.ts	100.00% <ø> (ø)
src/identity/reducer.ts	29.85% <ø> (ø)
... and 16 more

... and 73 files with indirect coverage changes

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[bakoushin]

🧹 Epic cleanup!