Add uuid to Service Ping metadata report

What does this MR do and why?

Instances that Submits Service Ping sends also metadata report along with it. This metadata includes information about metrics collection timing in order to help detect and fix underperforming metrics. This commit adds uuid to metadata, in order to tie this metadata to instance Service Ping report to better understand context of problematic metrics

Relates #364645 (closed)

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How to set up and validate locally

1. Checkout https://gitlab.com/gitlab-services/version-gitlab-com/-/merge_requests/690 and spin up local VersionApp server. If you do not have VersionApp set up locally follow this instruction

2. Change ServicePing:SubmitService to point to your local development VersionApp instance

diff --git a/app/services/service_ping/submit_service.rb b/app/services/service_ping/submit_service.rb
index 64793f5072c..e8236f9142d 100644
--- a/app/services/service_ping/submit_service.rb
+++ b/app/services/service_ping/submit_service.rb
@@ -102,6 +102,7 @@ def save_raw_usage_data(usage_data)
     # See https://gitlab.com/gitlab-org/gitlab/-/issues/233615 for details
     def base_url
       Rails.env.production? ? PRODUCTION_BASE_URL : STAGING_BASE_URL
+      'http://localhost:3000'
     end
   end
 end

3. In rails console $ bin/rails c enabled Service Ping and trigger report

[1] pry(main)> ApplicationSetting.current.update(usage_ping_enabled: true)
[2] pry(main)> ServicePing::SubmitService.new.execute

4. Look for incoming request to /usage_ping_metadata output in VersionApp

Started POST "/usage_ping_metadata" for ::1 at 2022-04-07 13:30:44 +0200
Processing by UsagePingMetadataController#create as HTML
  Parameters: {"uuid"=>"6b3578df-146d-4915-af4a-00fda80abac8", "metadata"=>{"metrics"=>[{"name"=>"version", "time_elapsed"=>3.00002284348011e-06}, {"name"=>"installation_type", "time_elapsed"=>8.999952115118504e-06}, {"name"=>"settings.ldap_encrypted_secrets_enabled", "time_elapsed"=>0.0013879999751225114}, {"name"=>"settings.smtp_encrypted_secrets_enabled", "time_elapsed"=>0.0005740000633522868}, {"name"=>"settings.operating_system", "time_elapsed"=>0.6089230000507087}, {"name"=>"settings.gitaly_apdex", "time_elapsed"=>0.012181999976746738}, {"name"=>"counts.assignee_lists", "time_elapsed"=>0.027057999977841973}, {"name"=>"counts.ci_builds", "time_elapsed"=>0.03883099998347461}, {"name"=>"counts.ci_internal_pipelines", "time_elapsed"=>0.029631000012159348},
....
{"uuid"=>"6b3578df-146d-4915-af4a-00fda80abac8", "metrics"=>[{"name"=>"usage_activity_by_stage_monthly.verify.projects_reporting_ci_cd_back_to_github", "time_elapsed"=>0.016271999920718372}, {"name"=>"installation_type", "time_elapsed"=>1.2999982573091984e-05}, {"name"=>"license_billable_users", "time_elapsed"=>0.001693999976851046}, {"name"=>"settings.ldap_encrypted_secrets_enabled", "time_elapsed"=>7.399998139590025e-05}, {"name"=>"settings.smtp_encrypted_secrets_enabled", "time_elapsed"=>3.300001844763756e-05}, {"name"=>"settings.operating_system", "time_elapsed"=>0.6754120000405237}, {"name"=>"settings.gitaly_apdex", "time_elapsed"=>0.0031090000411495566}, {"name"=>"counts.assignee_lists", "time_elapsed"=>0.013246000045910478}, {"name"=>"counts.ci_builds", "time_elapsed"=>0.014400999993085861}, {"name"=>"counts.ci_internal_pipelines", "time_elapsed"=>0.012971999938599765}]}

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