fix: pending events all

[fracasula]

Description

Adding new metric to query pending events on hosted given that workspaceId gets filtered out for free users.
Router pickup jobs won't be affected since they use their own in memory implementation.

Tested on dev.

Notion Ticket

< Notion Link >

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[codecov]

Codecov Report

Patch coverage: 84.03% and project coverage change: +0.29 🎉

Comparison is base (1b6af85) 53.09% compared to head (9293e49) 53.38%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3075      +/-   ##
==========================================
+ Coverage   53.09%   53.38%   +0.29%     
==========================================
  Files         332      342      +10     
  Lines       52350    52893     +543     
==========================================
+ Hits        27794    28236     +442     
- Misses      22956    23035      +79     
- Partials     1600     1622      +22     

Impacted Files	Coverage Δ
app/apphandlers/gatewayAppHandler.go	13.82% <ø> (ø)
app/apphandlers/setup.go	73.25% <ø> (ø)
gateway/internal/stats/stats.go	100.00% <ø> (ø)
jobsdb/admin.go	68.99% <0.00%> (ø)
runner/runner.go	69.66% <50.00%> (-0.61%)	⬇️
services/metric/registry.go	82.25% <50.00%> (-0.15%)	⬇️
testhelper/stats/prometheus.go	57.14% <57.14%> (ø)
regulation-worker/cmd/main.go	71.95% <62.50%> (-1.39%)	⬇️
services/stats/otel.go	73.00% <73.00%> (ø)
services/stats/statsd_measurement.go	75.55% <75.55%> (ø)
... and 25 more

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