Add support for Strategist to harvest rewards

[shahthepro]

Code Change

Right now, only harvesterAddr can call the collectRewardTokens on the strategies. This changeset will also allow the Strategist/Guardian to call it. It allows Harvester address to be different from the caller. It also enables the 2/8 to change the Harvester address.

The harvesterAddress zero-check is done in both internal and external function. It's because some strategies inherit the internal method, while other inherit the public method. If we do it in one place and forget to do this in the inherited strategies, the rewards could end up going to address(0). Right now, it won't happen because only harvester can call the rewards. It might not be the case going forward.

[codecov]

Codecov Report

❌ Patch coverage is 42.85714% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 46.96%. Comparing base (1a8b465) to head (692241e).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...acts/automation/ClaimStrategyRewardsSafeModule.sol	0.00%	6 Missing ⚠️
.../contracts/utils/InitializableAbstractStrategy.sol	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2853      +/-   ##
==========================================
- Coverage   49.10%   46.96%   -2.14%     
==========================================
  Files         112      112              
  Lines        4835     4842       +7     
  Branches     1338     1342       +4     
==========================================
- Hits         2374     2274     -100     
- Misses       2457     2564     +107     
  Partials        4        4              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[naddison36]

this if statement is duplicated in _collectRewardTokens

[shahthepro]

Yep, that's intentional and have left a comment about it as well. It's because some strategies inherit the internal method, while other inherit the public method. If we do it in one place and forget to do this in the inherited strategies, the rewards could end up going to address(0). Right now, it won't happen because only harvester can call the rewards. It might not be the case going forward.

[sparrowDom]

Left some comments, otherwise looks good

[sparrowDom]

LGTM