Perf - Remove support for perf.data as converted CTF files and rename appropriately

[ivberg]

CTF (LTTng format) support for perf never worked that well (like cpu sample stacks) and relied on a conversion that was very niche. Perf would have to be optionally compiled with this conversion support and is quite rare. This will be replaced by native support of perf.data binary format in a future PR that will occupy a similar namespace (hence the renames to more accurately reflect what is left)