Fix bftweight zero issue

[ishantiw]

What was the problem?

This PR resolves #8883 & #8905 & #8849

How was it solved?

• Introduce getBFTParametersActiveValidators to provide only active validators from BFT params.
• Fix verifyValidatorsUpdate bitmap verification to properly handle bftWeight === 0 in bftWeightUpdate

How was it tested?

Run multiple chains and enable chain connector plugin, change validator set by staking/unstaking and observe CCUs

[gkoumout]

Left few comments.

[gkoumout]

Two small comments, otherwise looks good. Moreover, don't we need to update tests for verifyValidatorsUpdate?

[codecov]

Codecov Report

Merging #8899 (a7c472c) into release/6.0.0 (a12b87f) will decrease coverage by 0.01%.
The diff coverage is 94.59%.

❗ Current head a7c472c differs from pull request most recent head 3396b05. Consider uploading reports for the commit 3396b05 to get more accurate results

@@                Coverage Diff                @@
##           release/6.0.0    #8899      +/-   ##
=================================================
- Coverage          83.61%   83.60%   -0.01%     
=================================================
  Files                601      601              
  Lines              22520    22537      +17     
  Branches            3319     3320       +1     
=================================================
+ Hits               18829    18843      +14     
- Misses              3691     3694       +3     

Files Changed	Coverage
framework/src/genesis_block.ts	50.00%
...ain-connector-plugin/src/chain_connector_plugin.ts	100.00%
framework/src/engine/bft/method.ts	100.00%
framework/src/engine/bft/utils.ts	100.00%
...ne/consensus/certificate_generation/commit_pool.ts	100.00%
framework/src/engine/endpoint/consensus.ts	100.00%
framework/src/engine/generator/generator.ts	100.00%
...rability/base_interoperability_internal_methods.ts	100.00%

[gkoumout]

Looks good, just one optional comment.