[Merged by Bors] - remove beacon from Syncer

[poszu]

Motivation

The IsBeaconSynced method of SyncStateProvider is not used anywhere.

Description

Removed SyncStateProvider::IsBeaconSynced

Test Plan

n/a

TODO

• [x] Explain motivation or link existing issue(s)
• [x] Test changes and document test plan
• [ ] Update documentation as needed
• [ ] Update changelog as needed

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 79.9%. Comparing base (f711c61) to head (58724e9). Report is 4 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #6450 +/- ## ========================================= - Coverage 79.9% 79.9% -0.1% ========================================= Files 352 352 Lines 46096 46091 -5 ========================================= - Hits 36865 36837 -28 - Misses 7142 7165 +23 Partials 2089 2089 ```

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[poszu]

bors merge

[spacemesh-bors[bot]]

Build failed:

• systest-status

[poszu]

bors merge

[spacemesh-bors[bot]]

Build failed:

• ci-status

[poszu]

bors merge

[spacemesh-bors[bot]]

Pull request successfully merged into develop.

Build succeeded:

• ci-status
• systest-status