Despite the size of this commit, the change is cosmetic. While renaming
the "Project" key in the change metadata is straightforward, renaming
the change list column header involves work in multiple components. This
is because the headers to be shown are defined inside the change table
behavior and are used by multiple other components. Consequently, the
label is renamed in users of that behavior and tests are updated.
Also remove a redundant test, rename change table methods for
consistency, and update labels in notification settings.
Bug: Issue 7755
Change-Id: I174c3fa203725f63b79dec86280263d6299f73cf
06a7d0ef5b