collector: call PdhGetRawCounterArrayW twice to get the correct amount of bytes needed.

[jkroepke]

What this PR does / why we need it

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

• fixes Spurious dips/zeros across multiple monotonic windows_process_* counters (Alloy v1.10.1 / windows_exporter v0.30.8) #2176

Special notes for your reviewer

Particularly user-facing changes

Checklist

Complete these before marking the PR as ready to review:

• DCO signed
• The PR title has a summary of the changes and the area they affect
• The PR body has a summary to reflect any significant (and particularly user-facing) changes introduced by this PR

[johanot]

@jkroepke did this PR stall due to lack of testers? :) Do you have a build of this branch we could potentially use for testing internally here?

[jkroepke]

@johanot Generally yes.

Reason for the stall PR is that comment: #2176 (comment) - that this does not help.