This commit adds generation of .ngsummary.js shims alongside .ngfactory.js shims when generated files are enabled. Generated .ngsummary shims contain a single, null export for every exported class with decorators that exists in the original source files. Ivy code does not depend on summaries, so these exist only as a placeholder to allow them to be imported and their values passed to old APIs. This preserves backwards compatibility. Testing strategy: this commit adds a compiler test to verify the correct shape and contents of the generated .ngsummary.js files. PR Close #26495
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