fix(core): remove slash suffix from uris [release]

[andersfylling]

Sometimes the requests urls ends with /. This becomes a problem when using GET parameters:
https://api.cognitedata.com/api/playground/projects/cognitesdk-js/documents/feedback/?status=CREATED

While /documents/feedback/?status=CREATED responds with a 404, /documents/feedback?status=CREATED responds with an expected 200 status code.

[codecov]

Codecov Report

Merging #628 (bf6cfc4) into master (29b3a17) will decrease coverage by 1.51%.
The diff coverage is 69.38%.

@@            Coverage Diff             @@
##           master     #628      +/-   ##
==========================================
- Coverage   77.15%   75.63%   -1.52%     
==========================================
  Files          87       90       +3     
  Lines        2779     3185     +406     
  Branches      390      440      +50     
==========================================
+ Hits         2144     2409     +265     
- Misses        599      776     +177     
+ Partials       36        0      -36     

Impacted Files	Coverage Δ
packages/stable/src/__tests__/testUtils.ts	100.00% <ø> (ø)
packages/stable/src/types.ts	100.00% <ø> (ø)
.../beta/src/api/templateGroups/templateGraphQlApi.ts	40.00% <14.28%> (-26.67%)	⬇️
packages/stable/src/api/3d/nodes3DApi.ts	81.81% <20.00%> (-18.19%)	⬇️
packages/stable/src/api/projects/projectsApi.ts	78.94% <20.00%> (-21.06%)	⬇️
packages/beta/src/types.ts	44.11% <33.33%> (-3.89%)	⬇️
packages/stable/src/api/3d/revisions3DApi.ts	95.65% <33.33%> (-4.35%)	⬇️
packages/core/src/baseCogniteClient.ts	74.54% <40.35%> (-17.46%)	⬇️
...eta/src/api/templateGroups/templateInstancesApi.ts	82.60% <50.00%> (-1.71%)	⬇️
packages/beta/src/cogniteClient.ts	96.96% <66.66%> (+0.09%)	⬆️
... and 83 more

[andersfylling]

To make a more unbiased argument; The RFC states that uri/path segments are to be separated by slashes. Given that get parameters aren't a segment, there should not be a slash after the path, separating the path and get parameters.