refactor(indexes): improve mempool tips index

[glevco]

Motivation

Improve handling of mempool tips on the index.

Acceptance Criteria

• When available, use vertex.name on graphviz and on vertex repr, which is useful for tests that use the DAGBuilder.
• Remove duplicate call to mempool_tips.update in vertex handler and move it to indexes.update.
• Refactor mempool_tips.update method:
  • Change the remove argument from an optional bool to just a bool. Since the code is only ever called with either True or None, we could remove the current False case and use it instead of None, allowing simplification of the logic. Also, it's renamed to force_remove.
  • Change logic to use the existing any_non_voided function instead of repeating it manually.
• Disable flak8 rule E731 do not assign a lambda expression, use a def. It was unnecessary and inconvenient.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[github-actions]

Bencher Report

Branch	refactor/mempool-tips-index
Testbed	ubuntu-22.04

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Benchmark	Latency	Benchmark Result minutes (m) (Result Δ%)	Lower Boundary minutes (m) (Limit %)	Upper Boundary minutes (m) (Limit %)
sync-v2 (up to 20000 blocks)	📈 view plot 🚷 view threshold	1.90 m (+12.69%) Baseline: 1.68 m	1.51 m (79.87%)	2.02 m (93.91%)

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[codecov]

Codecov Report

❌ Patch coverage is 91.89189% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.90%. Comparing base (18b35b7) to head (e2a6e7d).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
hathor/graphviz.py	0.00%	1 Missing and 1 partial ⚠️
hathor/indexes/manager.py	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1399      +/-   ##
==========================================
- Coverage   85.91%   85.90%   -0.02%     
==========================================
  Files         431      431              
  Lines       32701    32700       -1     
  Branches     5095     5096       +1     
==========================================
- Hits        28095    28090       -5     
- Misses       3588     3595       +7     
+ Partials     1018     1015       -3     

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