docs(actions): use GiB for runner capacity tables

[happysnaker]

Summary

• use GiB instead of GB in GitHub-hosted runner capacity tables where the values describe binary-sized memory and storage resources
• update the shared reusable tables so the terminology stays consistent across the runner reference docs
• align the larger runners reference with the same unit terminology

Closes #44033

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Table of review links

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The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
actions/reference/runners/larger-runners.md	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17
actions/reference/runners/github-hosted-runners.md	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17	from reusable

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Sharra-writes]

@happysnaker Again, no help wanted label. If I continue to find these, I will block this account.