build: ignore out of bound lines from ctags

[keegancsmith]

universal-ctags sometimes returns lines that are out of bounds. In practice it seems to only do an off by one. We haven't noticed the linenum error until a recent change of mine which didn't append an extra entry to NLS if the file was terminated by "\n". In practice this would end up being filtered out later on. So we update to just continue rather than error here.

An example is
https://github.com/sourcegraph/sourcegraph/blob/v5.2.2/client/web-sveltekit/.storybook/main.ts

$ universal-ctags '--fields=*' --output-format=json main.ts | grep 22
{"_type": "tag", "name": "config", "path": "main.ts", "pattern": "/^export default config$/", "language": "TypeScript", "line": 22, "kind": "constant", "roles": "def"}

$ wc -l main.ts
21 main.ts

$ tail -n1 main.ts
export default config

Test Plan: added a unit test

[jtibshirani]

Thanks! This helps explain why we didn't see a bunch of failures after deploying your fix ... scip-ctags does not have the same issue, and we use that by default for Typescript.