Trim method path parameters of leading slashes

[nfx]

Changes

Fundamentally prevent regressions like

PUT /api/2.0/fs/files//Volumes/main/x/y/z
> [non-JSON document of 11 bytes]. <io.Reader>
< HTTP/2.0 400 Bad Request
< {
<   "error_code": "BAD_REQUEST",
<   "message": "Invalid path"
< }

[codecov-commenter]

Codecov Report

Attention: 238 lines in your changes are missing coverage. Please review.

Comparison is base (af0eafe) 16.34% compared to head (3465497) 16.34%.

Files	Patch %	Lines
service/catalog/impl.go	0.00%	66 Missing ⚠️
service/iam/impl.go	0.00%	32 Missing ⚠️
service/sql/impl.go	0.00%	29 Missing ⚠️
service/sharing/impl.go	0.00%	19 Missing ⚠️
service/compute/impl.go	0.00%	16 Missing ⚠️
service/provisioning/impl.go	0.00%	16 Missing ⚠️
service/settings/impl.go	0.00%	16 Missing ⚠️
service/workspace/impl.go	0.00%	14 Missing ⚠️
service/pipelines/impl.go	0.00%	13 Missing ⚠️
service/ml/impl.go	0.00%	8 Missing ⚠️
... and 2 more

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #713   +/-   ##
=======================================
  Coverage   16.34%   16.34%           
=======================================
  Files          98       98           
  Lines       13996    13996           
=======================================
  Hits         2287     2287           
  Misses      11518    11518           
  Partials      191      191           

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[mgyucht]

Regenerating the SDK with this change does not change the generated code. The issue is that users can specify an initial / in this parameter, and it is documented as The absolute path of the file or directory in DBFS., where absolute paths begin with a /. However, if they do that, the path contains two consecutive /s.