feat: improve config and start process of yurthub component

[rambohe-ch]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:
/kind bug
/kind documentation
/kind enhancement
/kind good-first-issue
/kind feature
/kind question
/kind design
/sig ai
/sig iot
/sig network
/sig storage

/kind enhancement

What this PR does / why we need it:

1. improve cmd/yurthub/app/config/config.go and cmd/yurthub/app/start.go, initialize instance according to working mode. the code is improved as following:

switch workingMode {
case LocalMode:
// xxx

case CloudeMode:
// xxx

case EdgeMode:
// xxx
}

then remove working mode if condition except instance initialization, so it is easy to understand the features for each working mode.

2. move direct clientset manager into transport manager, because there are duplicated direct clientset management.
3. remove iptables manager from network manager, because iptables manager is deprecated from previous version.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

other Note

[rambohe-ch]

@zyjhtangtang @YTGhost PTAL

[codecov]

Codecov Report

Attention: Patch coverage is 38.98305% with 180 lines in your changes missing coverage. Please review.

Project coverage is 45.40%. Comparing base (5543dde) to head (69a4b1c).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/yurthub/app/config/config.go	50.00%	32 Missing and 7 partials ⚠️
cmd/yurthub/app/start.go	0.00%	39 Missing ⚠️
pkg/yurthub/transport/transport.go	52.38%	19 Missing and 1 partial ⚠️
pkg/yurthub/gc/gc.go	0.00%	15 Missing ⚠️
...kg/yurthub/proxy/nonresourcerequest/nonresource.go	39.13%	12 Missing and 2 partials ⚠️
pkg/yurthub/transport/fake_transport.go	41.66%	14 Missing ⚠️
pkg/yurthub/proxy/autonomy/autonomy.go	46.15%	6 Missing and 1 partial ⚠️
pkg/yurthub/otaupdate/ota.go	40.00%	3 Missing and 3 partials ⚠️
pkg/yurthub/proxy/proxy.go	0.00%	6 Missing ⚠️
pkg/yurthub/proxy/remote/loadbalancer.go	70.58%	3 Missing and 2 partials ⚠️
... and 5 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2303      +/-   ##
==========================================
- Coverage   45.51%   45.40%   -0.11%     
==========================================
  Files         408      407       -1     
  Lines       27049    26995      -54     
==========================================
- Hits        12310    12258      -52     
+ Misses      13522    13516       -6     
- Partials     1217     1221       +4     

Flag	Coverage Δ
unittests	45.40% <38.98%> (-0.11%)	⬇️

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[YTGhost]

still have problem when setup openyurt cluster with kind in e2e-test

[sonarqubecloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[rambohe-ch]

still have problem when setup openyurt cluster with kind in e2e-test

@YTGhost e2e errors have been fixed. please take a look.

[YTGhost]

/LGTM