EOL 18.04 Support

[djpolygon]

Description

End of Life for 18.04 support, all builds are compatible with Ubuntu 20.04 and newer.

Removes the dedicated runner hosted by Polygon, uses Github runner on 20.04

Changes

• [x ] Bugfix (non-breaking change that solves an issue)
• Hotfix (change that solves an urgent issue, and requires immediate attention)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Changes only for a subset of nodes

Breaking changes

Please complete this section if any breaking changes have been made, otherwise delete it

Nodes audience

In case this PR includes changes that must be applied only to a subset of nodes, please specify how you handled it (e.g. by adding a flag with a default value...)

Checklist

• I have added at least 2 reviewer or the whole pos-v1 team
• I have added sufficient documentation in code
• I will be resolving comments - if any - by pushing each fix in a separate commit and linking the commit hash in the comment reply
• Created a task in Jira and informed the team for implementation in Erigon client (if applicable)
• Includes RPC methods changes, and the Notion documentation has been updated

Cross repository changes

• This PR requires changes to heimdall
  • In case link the PR here:
• This PR requires changes to matic-cli
  • In case link the PR here:

Testing

• I have added unit tests
• I have added tests to CI
• I have tested this code manually on local environment
• I have tested this code manually on remote devnet using express-cli
• I have tested this code manually on mumbai
• I have created new e2e tests into express-cli

Manual tests

Please complete this section with the steps you performed if you ran manual tests for this functionality, otherwise delete it

Additional comments

Please post additional comments in this section if you have them, otherwise delete it

[codecov]

Codecov Report

Patch coverage: 31.73% and project coverage change: -0.21% ⚠️

Comparison is base (e502a81) 57.07% compared to head (bf3df86) 56.86%.
Report is 22 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #980      +/-   ##
===========================================
- Coverage    57.07%   56.86%   -0.21%     
===========================================
  Files          633      638       +5     
  Lines        77331    77863     +532     
===========================================
+ Hits         44138    44279     +141     
- Misses       29445    29817     +372     
- Partials      3748     3767      +19     

Files Changed	Coverage Δ
accounts/abi/bind/backends/bor_simulated.go	7.69% <0.00%> (-0.65%)	⬇️
consensus/bor/api.go	0.00% <0.00%> (ø)
consensus/bor/heimdall/metrics.go	9.09% <ø> (ø)
core/blockchain.go	61.49% <0.00%> (-0.27%)	⬇️
core/blockchain_reader.go	43.84% <0.00%> (-1.40%)	⬇️
core/rawdb/checkpoint.go	0.00% <0.00%> (ø)
core/rawdb/milestone.go	0.00% <0.00%> (ø)
eth/api.go	3.96% <0.00%> (-0.35%)	⬇️
eth/api_backend.go	0.00% <0.00%> (ø)
eth/backend.go	0.00% <0.00%> (ø)
... and 19 more

... and 26 files with indirect coverage changes

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