Be more explicit in release notes regarding the deprecation of certain vitess/lite tags

[frouioui]

Description

Small update to the v19.0.0 release notes to inform readers that MySQL/Percona version specific tags are deprecated in v19.0.0.

[vitess-bot]

Review Checklist

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[mattlord]

LGTM! Just one small idea/suggestion.

[codecov]

Codecov Report

Attention: 435 lines in your changes are missing coverage. Please review.

Comparison is base (eddb39e) 47.29% compared to head (d3cce7b) 47.49%.
Report is 72 commits behind head on main.

❗ Current head d3cce7b differs from pull request most recent head 8820dc9. Consider uploading reports for the commit 8820dc9 to get more accurate results

Files	Patch %	Lines
...vt/vtgate/planbuilder/operators/sharded_routing.go	0.00%	42 Missing ⚠️
go/vt/vtgate/semantics/early_rewriter.go	86.41%	23 Missing and 10 partials ⚠️
go/vt/vtgate/planbuilder/operators/delete.go	0.00%	32 Missing ⚠️
.../vtgate/planbuilder/operators/delete_with_input.go	0.00%	31 Missing ⚠️
go/vt/vtgate/engine/delete_with_input.go	53.70%	23 Missing and 2 partials ⚠️
...tgate/planbuilder/operators/aggregation_pushing.go	0.00%	25 Missing ⚠️
...vt/vtgate/planbuilder/operators/queryprojection.go	0.00%	20 Missing ⚠️
.../vt/vtgate/planbuilder/operators/query_planning.go	0.00%	19 Missing ⚠️
go/vt/vtgate/evalengine/expr_tuple_bvar.go	62.50%	14 Missing and 4 partials ⚠️
go/vt/vtgate/planbuilder/operators/phases.go	0.00%	16 Missing ⚠️
... and 45 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15040      +/-   ##
==========================================
+ Coverage   47.29%   47.49%   +0.19%     
==========================================
  Files        1137     1149      +12     
  Lines      238684   239387     +703     
==========================================
+ Hits       112895   113700     +805     
+ Misses     117168   117096      -72     
+ Partials     8621     8591      -30     

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