Get Agent IP every callback

[Cictrone]

What type of PR is this?

/kind bug

What this PR does / why we need it:

As documented in #704, we were seeing that Imix would sometimes check in faster than the networking stack would complete DHCP on some boxes. To solve this we will just refresh our primary_ip with each callback.

Which issue(s) this PR fixes:

Fixes #704

[Cictrone]

this stops an annoying and not very useful vs code pop-up. I would like to leave it in but if we don't want to I'll remove it.

[hulto]

Idk what this does

[Cictrone]

Some output for what it looks like while Imix waits for the box to have an IP:

 2024-03-14T22:07:25.030Z ERROR imix::config > failed to get primary ip: Local IP address not found
 2024-03-14T22:07:25.038Z INFO  imix::agent  > claimed 0 tasks
 2024-03-14T22:07:25.038Z INFO  imix::agent  > completed callback in 0s, sleeping for 5s
 2024-03-14T22:07:30.043Z ERROR imix::config > failed to get primary ip: Local IP address not found
 2024-03-14T22:07:30.050Z INFO  imix::agent  > claimed 0 tasks
 2024-03-14T22:07:30.051Z INFO  imix::agent  > completed callback in 0s, sleeping for 5s
 2024-03-14T22:07:35.053Z ERROR imix::config > failed to get primary ip: Local IP address not found
 2024-03-14T22:07:35.064Z INFO  imix::agent  > claimed 0 tasks
 2024-03-14T22:07:35.064Z INFO  imix::agent  > completed callback in 0s, sleeping for 5s
 2024-03-14T22:07:40.069Z ERROR imix::config > failed to get primary ip: Local IP address not found
 2024-03-14T22:07:40.076Z INFO  imix::agent  > claimed 0 tasks
 2024-03-14T22:07:40.077Z INFO  imix::agent  > completed callback in 0s, sleeping for 5s
 2024-03-14T22:07:45.082Z ERROR imix::config > failed to get primary ip: Local IP address not found
 2024-03-14T22:07:45.088Z INFO  imix::agent  > claimed 0 tasks
 2024-03-14T22:07:45.089Z INFO  imix::agent  > completed callback in 0s, sleeping for 5s
 2024-03-14T22:07:50.115Z INFO  imix::agent  > claimed 0 tasks
 2024-03-14T22:07:50.115Z INFO  imix::agent  > completed callback in 0s, sleeping for 5s
 2024-03-14T22:07:55.137Z INFO  imix::agent  > claimed 0 tasks
 2024-03-14T22:07:55.137Z INFO  imix::agent  > completed callback in 0s, sleeping for 5s
 2024-03-14T22:08:00.162Z INFO  imix::agent  > claimed 0 tasks
 2024-03-14T22:08:00.162Z INFO  imix::agent  > completed callback in 0s, sleeping for 5s
 2024-03-14T22:08:05.187Z INFO  imix::agent  > claimed 0 tasks
 2024-03-14T22:08:05.187Z INFO  imix::agent  > completed callback in 0s, sleeping for 5s
 2024-03-14T22:08:10.208Z INFO  imix::agent  > claimed 0 tasks
 2024-03-14T22:08:10.209Z INFO  imix::agent  > completed callback in 0s, sleeping for 5s

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 19 lines in your changes are missing coverage. Please review.

Project coverage is 71.95%. Comparing base (b2aa17e) to head (e004008).

Files	Patch %	Lines
implants/imix/src/config.rs	0.00%	14 Missing ⚠️
implants/imix/src/agent.rs	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #711      +/-   ##
==========================================
- Coverage   72.06%   71.95%   -0.12%     
==========================================
  Files         175      175              
  Lines       12232    12251      +19     
==========================================
  Hits         8815     8815              
- Misses       3202     3221      +19     
  Partials      215      215              

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[hulto]

Bless