chore: remove v2 naming related to legacy frontend

[BugenZhao]

What's changed and what's your intention?

This PR removes v2 naming from the catalog, risedev, and crate names.

Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests

Refer to a related PR or issue link (optional)

• Tracking: Clean compatible code for legacy frontend #2539
• Meta: remove catalog v1 #2555

[yezizp2012]

LGTM

[codecov]

Codecov Report

Merging #2572 (b7b46ea) into main (523b669) will increase coverage by 0.00%.
The diff coverage is 9.09%.

@@           Coverage Diff           @@
##             main    #2572   +/-   ##
=======================================
  Coverage   71.93%   71.93%           
=======================================
  Files         676      676           
  Lines       87551    87546    -5     
=======================================
  Hits        62980    62980           
+ Misses      24571    24566    -5     

Flag	Coverage Δ
rust	71.93% <9.09%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/cmd_all/src/bin/risingwave.rs	1.81% <0.00%> (+0.07%)	⬆️
src/cmd_all/src/playground.rs	0.00% <0.00%> (ø)
src/frontend/src/observer/observer_manager.rs	0.00% <0.00%> (ø)
src/meta/src/model/catalog.rs	97.50% <ø> (ø)
src/meta/src/model/mod.rs	95.58% <ø> (ø)
src/risedevtool/src/bin/risedev-playground.rs	0.30% <0.00%> (ø)
src/risedevtool/src/compose.rs	0.00% <0.00%> (ø)
src/risedevtool/src/task.rs	0.00% <ø> (ø)
src/risedevtool/src/task/frontend_service.rs	0.00% <0.00%> (ø)
src/meta/src/manager/catalog.rs	20.00% <22.22%> (ø)

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