delete yurt tunnel helm charts

[River-sh]

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/kind documentation
/kind feature

What this PR does / why we need it:

the yurt-tunnel will be non-essential component

Which issue(s) this PR fixes:

Fixes #

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Does this PR introduce a user-facing change?

other Note

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What type of PR is this?

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/kind bug
/kind documentation
/kind enhancement
/kind good-first-issue
/kind feature
/kind question
/kind design
/sig ai
/sig iot
/sig network
/sig storage

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

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[codecov]

Codecov Report

Merging #1161 (2d60a3c) into master (4ed04ca) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1161      +/-   ##
==========================================
+ Coverage   52.11%   52.12%   +0.01%     
==========================================
  Files         116      116              
  Lines       14496    14496              
==========================================
+ Hits         7554     7556       +2     
+ Misses       6259     6258       -1     
+ Partials      683      682       -1     

Flag	Coverage Δ
unittests	52.12% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/util/iptables/iptables.go	87.67% <0.00%> (+0.54%)	⬆️

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[rambohe-ch]

@River-sh Yes, we will use raven to replace yurt-tunnel, and raven will provide more common network capabilities for OpenYurt.

[rambohe-ch]

/lgtm
/approve

[openyurt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rambohe-ch, River-sh

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