fix: trim suffix backslash in cluster server URL

[imrenagi]

solving #3993

Signed-off-by: Imre Nagi imre.nagi@go-jek.com

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Optional. My organization is added to USERS.md.
• I've signed the CLA and my build is green (troubleshooting builds).

[imrenagi]

@jannfis please take a look to this one. thanks!

[codecov-commenter]

Codecov Report

Merging #4037 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #4037   +/-   ##
=======================================
  Coverage   42.36%   42.36%           
=======================================
  Files         123      123           
  Lines       18200    18200           
=======================================
  Hits         7710     7710           
  Misses       9491     9491           
  Partials      999      999           

Impacted Files	Coverage Δ
util/db/cluster.go	63.86% <100.00%> (ø)

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[alexmt]

LGTM