[java] WebSocket NoVNC session against the grid URL contains trailing slash

[VietND96]

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Description

[java] WebSocket NoVNC session against the grid URL contains trailing slash

Motivation and Context

We are going to the situation when --grid-url contains trailing slash, e.g. http://my.domain.com/
Based on the grid URL, others NoVNC, CDP, BiDi urls are constructed with double-slash http://my.domain.com//session, which caused a redirect issue (mentioned in SeleniumHQ/docker-selenium#2075)
Users no longer have to worry about the trailing slash.
Fix: SeleniumHQ/docker-selenium#2075

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (64d9c87) 58.05% compared to head (4b0e63d) 58.05%.
Report is 3 commits behind head on trunk.

❗ Current head 4b0e63d differs from pull request most recent head 56c8fea. Consider uploading reports for the commit 56c8fea to get more accurate results

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Additional details and impacted files

@@           Coverage Diff           @@
##            trunk   #13353   +/-   ##
=======================================
  Coverage   58.05%   58.05%           
=======================================
  Files          88       88           
  Lines        5338     5338           
  Branches      224      224           
=======================================
  Hits         3099     3099           
  Misses       2015     2015           
  Partials      224      224           

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[diemol]

Thank you, @VietND96!