refactor: deprecate jsxTemplates

[johnsoncodehk]

In the past, we generated jsx format virtual code for templates based on the jsxTemplates option to obtain complete generic support, but with 1.4 substantially refactoring virtual code generation, we found a way to support generics for class components and functional components at the same time without relying on jsx , if you are interested in the principle, here is the playground link.

https://www.typescriptlang.org/play?#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-2xQOJeAy+C4NAIbK5MAAC3Aw3gcDQuAgWAwWaIqwgrxA0spErYLigbjNbvC7K5GB5fIFaGFovFNKlZNlCuVqvVmu1WDDNAATAbG1bGba3dwG03lyz7f54Gv3BvGJHW9J4D6O36jwng6GOjPD56T7GLywg3pk6n0zlwDmwHmC0WS2WFZVpYQA

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Why is this important?

• Currently template codegen is too complicated, it makes sense to simplify it in any way to improve maintainability, and removing jsxTemplates can reduce a lot of codegen code.
• This makes JSX issues in template #592 problem become history, we don't have this mess anymore
• This eliminates inconsistencies such as Fallthrough attributes are recognized as errors #2671

Note that this is not a breaking change, users should not be aware of this change, but just remove the jsxTemplates option from tsconfig as it is no longer needed.

Target version: >= v1.5.0 pre-release