Add jwt keys

[hulto]

What type of PR is this?

/kind feature

What this PR does / why we need it:

• Adds a JWT to claim tasks API
• Agent passes jwt to report and fetch calls
• Server verifies JWT is not valid
• For now warns when invalid will error when imixv1 is removed.

Which issue(s) this PR fixes:

Fixes #

[github-actions]

Summary

Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
2960    ±0	2960    ±0	0    ±0	0    ±0	0    ±0	0    ±0	1ms    ±0

Previous Results

Build 🏗️	Result 🧪	Tests 📝	Passed ✅	Failed ❌	Skipped ⏭️	Other ❓	Flaky 🍂	Duration ⏱️
#392	✅	2960	2960	0	0	0	0	30.9s

Insights

Average Tests per Run	Total Flaky Tests	Total Failed	Slowest Test (p95)
2960	0	0	39.9s

Slowest Tests

Test 📝	Results 📊	Duration (avg) ⏱️	Duration (p95) ⏱️
eldritch: random::string_impl::tests::test_string_uniform	3	38.0s	39.9s
eldritch: random::string_impl::tests::test_string_uniform	3	38.0s	39.9s
eldritch: random::string_impl::tests::test_string_uniform	3	38.0s	39.9s
eldritch: process::info_impl::tests::test_info_default	3	3.4s	9.7s
eldritch: process::info_impl::tests::test_info_default	3	3.4s	9.7s
eldritch: process::info_impl::tests::test_info_default	3	3.4s	9.7s
eldritch: pivot::port_scan_impl::tests::test_portscan_return_type_starlark_dict_from_interpreter	3	3.0s	8.9s
eldritch: pivot::port_scan_impl::tests::test_portscan_return_type_starlark_dict_from_interpreter	3	3.0s	8.9s
eldritch: pivot::port_scan_impl::tests::test_portscan_return_type_starlark_dict_from_interpreter	3	3.0s	8.9s
eldritch: pivot::ssh_copy_impl::tests::test_pivot_ssh_copy	3	4.3s	8.8s

_{🎉 No failed tests in this run. | 🍂 No flaky tests in this run.}

Github Test Reporter by CTRF 💚

🔄 This comment has been updated

[KCarretto]

Please also remove the committed 83MB tavern binary tavern/tavern

[KCarretto]

I feel pretty strongly about adding a TaskContext to make this cleaner, otherwise lgtm