chore: remove v2beta2 API Version

[tao12345666333]

ref: #707

Signed-off-by: Jintao Zhang zhangjintao9020@gmail.com

Type of change:

• Bugfix
• New feature provided
• Improve performance
• Backport patches

What this PR does / why we need it:

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[codecov-commenter]

Codecov Report

Merging #1431 (ecf1326) into master (6b38e80) will increase coverage by 1.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1431      +/-   ##
==========================================
+ Coverage   40.38%   41.49%   +1.10%     
==========================================
  Files          82       82              
  Lines        7445     7246     -199     
==========================================
  Hits         3007     3007              
+ Misses       4090     3891     -199     
  Partials      348      348              

Impacted Files	Coverage Δ
pkg/api/validation/apisix_consumer.go	0.00% <ø> (ø)
pkg/api/validation/apisix_route.go	24.59% <ø> (+2.85%)	⬆️
pkg/api/validation/apisix_tls.go	0.00% <ø> (ø)
pkg/api/validation/apisix_upstream.go	0.00% <ø> (ø)
pkg/config/config.go	66.34% <ø> (ø)
pkg/providers/apisix/translation/apisix_route.go	31.51% <ø> (+6.48%)	⬆️
pkg/providers/apisix/translation/translator.go	0.00% <ø> (ø)

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