This flag will be used to properly update the sidebar after the slash
commands have been processed.

Fix LFS object access check

Added tests for the fix started in gitlab-org/gitlab-ce!7417, since the scenario is EE specific.

Fixes gitlab-org/gitlab-ce#24392

cc @stanhu @ahanselka

See merge request !865

It is needed for the `lfs_check_access!` callback when the repository size limit is enabled (EE only).

Gracefully recover from previously failed rebase

Closes #1119

See merge request !857

I've also applied other minor refactorings and fixed a broken spec.

This is to have consistency with the #time_spent method on Issuables
that returns 0 when the user has not entered any info about it.

This method returns the total spent time that the user has declared
through the `/spend` slash command.

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