feat(localenv): add histogram for outgoing payment completion time

[njlie]

Changes proposed in this pull request

• Collects and publishes the telemetry on how long a Rafiki instance takes to complete processing an outgoing payment.
• Adds a graph in the local environment's Grafana dashboard to display the times spent processing an outgoing payment.

Context

Closes #3397 / RAF-1048.

Checklist

• Related issues linked using fixes #number
• Tests added/updated
• Make sure that all checks pass
• Bruno collection updated (if necessary)
• Documentation issue created with user-docs label (if necessary)
• OpenAPI specs updated (if necessary)

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[github-actions]

🚀 Performance Test Results

Test Configuration:

• VUs: 4
• Duration: 1m0s

Test Metrics:

• Requests/s: 45.80
• Iterations/s: 15.28
• Failed Requests: 0.00% (0 of 2754)

📜 Logs

> performance@1.0.0 run-tests:testenv /home/runner/work/rafiki/rafiki/test/performance
> ./scripts/run-tests.sh -e test "-k" "-q" "--vus" "4" "--duration" "1m"

Cloud Nine GraphQL API is up: http://localhost:3101/graphql
Cloud Nine Wallet Address is up: http://localhost:3100/
Happy Life Bank Address is up: http://localhost:4100/
cloud-nine-wallet-test-backend already set
cloud-nine-wallet-test-auth already set
happy-life-bank-test-backend already set
happy-life-bank-test-auth already set
     data_received..................: 960 kB 16 kB/s
     data_sent......................: 1.9 MB 32 kB/s
     http_req_blocked...............: avg=8.11µs  min=2.46µs   med=4.97µs   max=5.72ms   p(90)=6.2µs    p(95)=6.7µs   
     http_req_connecting............: avg=235ns   min=0s       med=0s       max=158.56µs p(90)=0s       p(95)=0s      
     http_req_duration..............: avg=86.73ms min=8.21ms   med=73.54ms  max=528.25ms p(90)=149.01ms p(95)=170.13ms
       { expected_response:true }...: avg=86.73ms min=8.21ms   med=73.54ms  max=528.25ms p(90)=149.01ms p(95)=170.13ms
     http_req_failed................: 0.00%  ✓ 0         ✗ 2754
     http_req_receiving.............: avg=79.43µs min=28µs     med=69.55µs  max=4.25ms   p(90)=103.36µs p(95)=127.84µs
     http_req_sending...............: avg=36.52µs min=8.91µs   med=26.57µs  max=2.26ms   p(90)=40.61µs  p(95)=56.3µs  
     http_req_tls_handshaking.......: avg=0s      min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=86.62ms min=8.06ms   med=73.44ms  max=527.54ms p(90)=148.78ms p(95)=170.03ms
     http_reqs......................: 2754   45.803319/s
     iteration_duration.............: avg=261.5ms min=155.87ms med=247.06ms max=1.02s    p(90)=323.72ms p(95)=355.44ms
     iterations.....................: 919    15.284405/s
     vus............................: 4      min=4       max=4 
     vus_max........................: 4      min=4       max=4