Upgrade Octant to v0.16.1 & Add alerts for traceflow UI

[ZhangYW18]

To add alerts for traceflow UI, we need to upgrade Octant to v0.16.1 first to make alerts available in Octant plugins.
In Octant, alerts appear on the top of webpage like this:

In default, it will expire after 10 seconds.

When a user creates a traceflow via UI successfully, we will notify the user like the image above.
When there's something illegal in users' input, we will notify the user how it went wrong:

[antrea-bot]

Thanks for your PR.
Unit tests and code linters are run automatically every time the PR is updated.
E2e, conformance and network policy tests can only be triggered by a member of the vmware-tanzu organization. Regular contributors to the project should join the org.

The following commands are available:

• /test-e2e: to trigger e2e tests.
• /skip-e2e: to skip e2e tests.
• /test-conformance: to trigger conformance tests.
• /skip-conformance: to skip conformance tests.
• /test-whole-conformance: to trigger all conformance tests on linux.
• /skip-whole-conformance: to skip all conformance tests on linux.
• /test-networkpolicy: to trigger networkpolicy tests.
• /skip-networkpolicy: to skip networkpolicy tests.
• /test-windows-conformance: to trigger windows conformance tests.
• /skip-windows-conformance: to skip windows conformance tests.
• /test-windows-networkpolicy: to trigger windows networkpolicy tests.
• /skip-windows-networkpolicy: to skip windows networkpolicy tests.
• /test-hw-offload: to trigger ovs hardware offload test.
• /skip-hw-offload: to skip ovs hardware offload test.
• /test-all: to trigger all tests (except whole conformance).
• /skip-all: to skip all tests (except whole conformance).

[ZhangYW18]

@mengdie-song Could you help me add reviewers for this pull request as I do not have permission to do so?

[mengdie-song]

@ZhangYW18 Sure, I will also review this later.

[codecov-io]

Codecov Report

Merging #1371 into master will increase coverage by 3.23%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1371      +/-   ##
==========================================
+ Coverage   64.59%   67.83%   +3.23%     
==========================================
  Files         159      159              
  Lines       12654    12744      +90     
==========================================
+ Hits         8174     8645     +471     
+ Misses       3629     3191     -438     
- Partials      851      908      +57     

Flag	Coverage Δ
#integration-tests	47.54% <ø> (+2.52%)	⬆️
#kind-e2e-tests	55.62% <ø> (+4.80%)	⬆️
#unit-tests	42.27% <ø> (+0.09%)	⬆️

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

Impacted Files	Coverage Δ
pkg/apiserver/certificate/certificate.go	71.05% <0.00%> (-6.58%)	⬇️
pkg/apis/controlplane/v1beta1/sets.go	39.70% <0.00%> (-4.42%)	⬇️
pkg/apiserver/storage/ram/watch.go	90.38% <0.00%> (-3.85%)	⬇️
...kg/controller/networkpolicy/store/networkpolicy.go	77.96% <0.00%> (-3.39%)	⬇️
pkg/agent/agent.go	49.85% <0.00%> (-2.09%)	⬇️
...ntroller/networkpolicy/networkpolicy_controller.go	67.03% <0.00%> (-1.12%)	⬇️
...ntroller/networkpolicy/networkpolicy_controller.go	80.56% <0.00%> (-0.54%)	⬇️
pkg/agent/controller/networkpolicy/cache.go	84.85% <0.00%> (-0.13%)	⬇️
pkg/antctl/antctl.go	100.00% <0.00%> (ø)
pkg/agent/flowexporter/connections/conntrack.go	84.21% <0.00%> (ø)
... and 16 more

[mengdie-song]

LGTM

[ZhangYW18]

@gran-vmv Will you review this PR?

[gran-vmv]

LGTM. Please verify this for common user errors.

[gran-vmv]

/test-all

[tnqn]

LGTM

[tnqn]

/test-all

[tnqn]

I believe the failure in e2e is not related. But just in case, testing another time.
/test-e2e