To me "street photography" means small, unobtrusive lenses. Preferably primes with relatively large apertures. For street photography it also can be useful for a lens to have a distance scale, to allow pre-focusing techniques.
If manual focusing is fine, as you state, then there are a great many other lenses you should be looking at, besides Canon EF. Simple adapters would open a whole world of very affordable, excellent vintage Canon FD (FD"n" or "new" tend to be more compact), Nikkor F-mount, Olympus OM, and many others. On a mirrorless like the a7ii, even vintage rangefinder lenses are usable... and along with their adapters, might be more compact than comparable SLR lenses. Some of those vintage lenses can be bought for a song!
Since the a7ii is a full frame camera, among modern Canon lenses you need to stick with EF and avoid EF-S which are "crop only" designs. Also be aware that USM and STM lenses allow full time manual focus override... they don't need to have the AF first turned off, before manual focusing. Some Canon EF lenses (including the older 50mm f/1.8 II, earlier non-USM versions of 35mm f/2, 28mm f/2.8 and 24mm f/2.8, among others) CANNOT be manually focused without first turning AF off at the switch. Failing to do so
will damage the auto focus mechanism of the lens. These "micro motor" lenses that require you turn off AF first, before manually focusing them, can best be identified by
NOT having either STM or USM in their designation. There are just a few manual-focus-only "specialty" Canon lenses also without those STM and USM auto focus drive designations, including the TS-E "Tilt Shift" lenses and the ultra high magnification MP-E 65mm macro lens, but I doubt any of those would be among the usual choices for street photography.
With a few exceptions, USM lenses can be manually focused without power. Several USM (the 85mm f/1.2 is one that comes to mind) and all STM lenses are "fly by wire"... These require power from the camera even to manually focus. When off the camera or when the camera is turned off or "asleep", the focus ring of the lens will merely spin freely and do nothing. This probably won't be an issue, just something to be aware of with STM lenses, especially.
Personally, for candid street photography I wouldn't ever use a big, white lens like the 28-300mm, which sort of screams "HEY! I'm taking your picture".
My favorites for that type of photography have been compact 21mm or 24mm, a 35mm or 40mm, and possibly/occasionally an 85mm, 100mm or 135mm. These focal lengths would be what I'd carry for full frame (for crop cameras I'd use their equivalents).
Some Canon EF lenses that are reasonably compact, have a distance scale, and would be usable both for AF and manual focus:
EF 24mm f/2.8 IS USM
EF 28mm f/1.8 USM (the matched lens hood is quite compact too).
EF 35mm f/2 IS USM
EF 40mm f/2.8 STM (a very small "pancake" lens, not much of a manual focus ring tho)
EF 85mm f/1.8 USM
EF 100mm f/2 USM (not a macro lens, this is a stop faster and smaller)
Some interesting third party lenses in Canon EF mount (might be able to simply get them in E-mount, tho). Many of these are manual-focus, manual-aperture designs:
Mitakon Zhongyi 35mm f/2
Yongnuo 60mm f/2
Samyang/Rokinon 85mm f/1.4
Opteka 85mm f/1.8
Mitakon Zhongyi 85mm f/2
Yongnuo 100mm f/2
Mitakon Zhongyi 135mm f/2.8
I'm considering putting together a "street photography" mirrorless kit, myself. To be as compact as possible, I'll probably stick with an APS-C camera though, such as the Canon M5. (This is more for "fun" than for "work", so isn't high priority.... but a couple folks owe me some money and, once I collect that, I might splurge a little!
)
I'll second the above recommendation for Samyang lenses, which also sell under Rokinon and, sometimes, Bower brand names. I'm considering some of their crop-only primes for use with the APS-C mirrorless and have done a lot of research on them... they've gotten a lot of praise for such high specification, yet affordable lenses. These are mostly manual focus, manual aperture lenses.... but they have recently introduced a few with AF and electronically controlled apertures, too.