Implement total rate accumulation and enhance telemetry_chargeback role

[ayefimov-1]

This commit consolidates all enhancements to the telemetry_chargeback role:

Major Features:

• Implement job-level total rate accumulation across scenarios
• Add total_rate_job variable to track cumulative rates
• Display accumulated total at job completion
• Rename total_rating → total_rate_scenario for clarity

CloudKitty Rate Calculation Fixes:

• Fix transformation order: conversion BEFORE mutation (per CloudKitty docs)
• Add factor/offset unit conversion support (e.g., bytes to GiB)
• Implement mutate transformations (CEIL, FLOOR, NUMBOOL, NOTNUMBOOL)
• Add fraction parser for factor values (e.g., '1/1048576')

Data Generation Improvements:

• Remove time_step_gap for exact timestep division
• Generate timesteps that exactly divide the time range
• Set end_time to 2 hours before current time (not current time)
• Fix sequential scenario time ranges (no overlap)

Test Scenario Updates:

• Update test_dyn_basic.yml: step_seconds 14400→600, add factor conversions
• Update test_static.yml: step_seconds 7200→600, add factor conversions
• Use realistic CloudKitty unit conversion patterns
• Increase limit: 50→1500 to handle more data entries

Lint and Validation:

• Fix yamllint line length warnings (80 char limit)
• Use multi-line YAML formatting (>-) for long lines
• Pass ansible-lint production profile
• Python PEP8 compliant

Files Changed:

• defaults/main.yml: Increase limit, add output file paths
• vars/main.yml: Add total_rate_job initialization
• tasks/main.yml, run_test_scenarios.yml: Add accumulation logic
• tasks/loki_total_rate.yml: Add job total display (new file)
• files/gen_db_summary.py: Fix rate calculation, rename field
• files/gen_synth_loki_data.py: Fix timestep generation, add end_time offset
• files/test_*.yml: Update step_seconds, add factor fields

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https://gateway-cloud-softwarefactory.apps.ocp.cloud.ci.centos.org/zuul/t/rdoproject.org/buildset/603cb1778cd64792b1c76182fe1dfeda

✔️ telemetry-openstack-meta-content-provider-master SUCCESS in 2h 37m 08s
❌ functional-chargeback-tests-osp18 FAILURE in 1h 50m 28s
✔️ functional-tests-osp18 SUCCESS in 2h 14m 23s