Remove reliance on mount process from read-object hook

[jrbriggs]

Rather than sending a message to the mount process, investigate simply acquiring the objects inline.

[github-actions]

Labeling this issue as stale. There has been no activity for 30 days. Remove stale label or comment or this issue will be closed in 7 days.

[github-actions]

Labeling this issue as stale. There has been no activity for 30 days. Remove stale label or comment or this issue will be closed in 7 days.

[github-actions]

Labeling this issue as stale. There has been no activity for 30 days. Remove stale label or comment or this issue will be closed in 7 days.

[jeffhostetler]

We should be able to use the new git-gvfs-helper (with a yet to be written background process mode) to fetch individual items in series (and with only 1 cred/auth setup).