Better error handling

.changeset/weak-monkeys-reflect.md

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+---
+"@apollo/generate-persisted-query-manifest": patch
+---
+
+Provides more robust error handling and reporting.
+
+* Collect all errors while generating manifest and report them together at once. Previously it would exit as soon as an error was encountered, even if there were multiple issues.
+* Update the error reporting format to make it much easier to determine which file contains the error.