chore: automatically age out old TypeScript versions from testing #31960
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In our integ tests, we were testing TypeScript versions from 3.9 up to the latest version, which recently broke because of a change to modernize the init templates.
We should up this range to a recent version; the common support lifetime of a TypeScript version is the one on
DefinitelyTyped
, the types registry for TypeScript packages. They only target TS versions less than 2 years old, which at the time of this PR is 4.9 and higher.Encode that policy into code automatically, so that we don't have to manually keep this minimum version up-to-date. This currently ages out the following versions:
Unfortunately not enough to save the TypeScript template modernization change entirely... but at least it's an improvement.
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