Further debugging of the event detector

[hellais]

• Add support for warming up the event detector
• Remove the variance label
• Fix alert query parameter passing

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.86%. Comparing base (6fd1e35) to head (46b8272).

❌ Your project check has failed because the head coverage (77.86%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

❗ There is a different number of reports uploaded between BASE (6fd1e35) and HEAD (46b8272). Click for more details.

HEAD has 7 uploads less than BASE

Flag	BASE (6fd1e35)	HEAD (46b8272)
oonidata	10	5
oonipipeline	2	0

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #152      +/-   ##
==========================================
- Coverage   83.92%   77.86%   -6.07%     
==========================================
  Files          85       33      -52     
  Lines        5220     1938    -3282     
==========================================
- Hits         4381     1509    -2872     
+ Misses        839      429     -410     

Flag	Coverage Δ
oonidata	77.86% <ø> (ø)
oonipipeline	?

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[hellais]

This will require running the following migration queries on clickhouse:

ALTER TABLE event_detector_cusums
    DROP COLUMN dns_isp_blocked_obs_w_sum,
    DROP COLUMN dns_isp_blocked_w_sum,
    DROP COLUMN dns_other_blocked_obs_w_sum,
    DROP COLUMN dns_other_blocked_w_sum,
    DROP COLUMN tcp_blocked_obs_w_sum,
    DROP COLUMN tcp_blocked_w_sum,
    DROP COLUMN tls_blocked_obs_w_sum,
    DROP COLUMN tls_blocked_w_sum;

ALTER TABLE event_detector_cusums
    ADD COLUMN dns_isp_blocked_current_state String DEFAULT 'ok',
    ADD COLUMN dns_other_blocked_current_state String DEFAULT 'ok',
    ADD COLUMN tcp_blocked_current_state String DEFAULT 'ok',
    ADD COLUMN tls_blocked_current_state String DEFAULT 'ok';

ALTER TABLE event_detector_changepoints
    DROP COLUMN IF EXISTS dns_isp_blocked_obs_w_sum,
    DROP COLUMN IF EXISTS dns_isp_blocked_w_sum,
    DROP COLUMN IF EXISTS dns_other_blocked_obs_w_sum,
    DROP COLUMN IF EXISTS dns_other_blocked_w_sum,
    DROP COLUMN IF EXISTS tcp_blocked_obs_w_sum,
    DROP COLUMN IF EXISTS tcp_blocked_w_sum,
    DROP COLUMN IF EXISTS tls_blocked_obs_w_sum,
    DROP COLUMN IF EXISTS tls_blocked_w_sum,
    DROP COLUMN IF EXISTS current_mean;

ALTER TABLE event_detector_changepoints
    ADD COLUMN IF NOT EXISTS current_state String DEFAULT 'ok';