chore: shorter message in v3 upgrade dialog

[frankqianms]

No description provided.

[codecov]

Codecov Report

Merging #7690 (62a05cb) into dev (4aaa1c2) will increase coverage by 0.04%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #7690      +/-   ##
==========================================
+ Coverage   77.19%   77.23%   +0.04%     
==========================================
  Files         592      592              
  Lines       40196    40192       -4     
  Branches     7842     7843       +1     
==========================================
+ Hits        31031    31044      +13     
+ Misses       5856     5834      -22     
- Partials     3309     3314       +5     

Impacted Files	Coverage Δ
packages/server/src/serverConnection.ts	85.00% <0.00%> (-0.22%)	⬇️
...ackages/fx-core/src/component/coordinator/index.ts	80.28% <0.00%> (-0.21%)	⬇️
packages/server/src/apis.ts	100.00% <0.00%> (ø)
packages/vscode-extension/src/handlers.ts	46.20% <0.00%> (+<0.01%)	⬆️
packages/fx-core/src/component/question.ts	77.57% <0.00%> (+1.40%)	⬆️
packages/fx-core/src/core/question.ts	75.86% <0.00%> (+2.28%)	⬆️
...fx-core/src/component/utils/ResourceGroupHelper.ts	63.84% <0.00%> (+3.84%)	⬆️

[therealjohn]

I have changes to this message and many others in #7425. However, this PR would make this message shorter than my suggestion - is there a technical reason it needs to be shorter?

[frankqianms]

I have changes to this message and many others in #7425. However, this PR would make this message shorter than my suggestion - is there a technical reason it needs to be shorter?

Yes. We've talked with PMs, and we agreed that long messages will annoy users and decrease their wills to upgrade. There should be only two key points in the messages: 1. To tell users that they can not develop their pjs with new extension, so that they have to upgrade pjs, 2. To tell users that there will be backups and decrease their worries of upgrading.