fix(elt-common): m365 client type errors

[WHTaylor]

I was experimenting with type checking as part of #430, and ty flagged basically 3 categories of errors in elt-common:

1. The couple fixed here
2. Problems from dependencies (e.g. the pyarrow.compute functions don't seem to be exposed to the type checker correctly)
3. Problems in the dlt_sources and dlt_destinations packages, which will be removed fairly soon anyway (after we migrate prod to Replace dlt framework and overhaul ingestion code #321)

Will hopefully look into 2 separately at some point. If we resolve that, and remove the dlt stuff, we could then integrate typechecking as part of CI for an extra safety net.

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• elt-common/src/elt_common/sources/m365/client.py

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[martyngigg]

Nice. Making good strides towards #231.

As you identified , dlt was causing quite a lot of trouble for ty so it'll be nice to be able to implement this.