cli/command/context: fix error-handling of skip-tls-verify

[thaJeztah]

• fixes CLI raises spurious error on docker context create (CLI v 28) #5849
• introduced in cli/command: use errors.Join instead of our own implementation #5791

Before 2b9a4d5, this function would use "errors.Wrap" which returns nil if the original error was nil. fmt.Errorf does not do this, so without a nil check, it would unconditionally return an error;

docker context create arm64 --docker host=ssh://172.17.101.26,skip-tls-verify=False

unable to create docker endpoint config: name: %!w(<nil>)

- What I did

- How I did it

- How to verify it

- Human readable description for the release notes

Fix `docker context create` always returning an error when using the  "skip-tls-verify" option.

- A picture of a cute animal (not mandatory but encouraged)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 58.88%. Comparing base (f9ced58) to head (7e71782).
Report is 18 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5850      +/-   ##
==========================================
+ Coverage   58.81%   58.88%   +0.07%     
==========================================
  Files         349      349              
  Lines       29556    29562       +6     
==========================================
+ Hits        17382    17409      +27     
+ Misses      11189    11171      -18     
+ Partials      985      982       -3