Draft: Add timestamp parsing to jog log viewer

What does this MR do and why?

Adds compatibility with runner logs that have been generated with FF_TIMESTAMPS.

It parses and displays the log timestamp when found.

Changelog: added

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Before	After

How to set up and validate locally

1. Ensure you are running an update version of gitlab-runner
2. Create a pipeline that uses FF_TIMESTAMPS: "true"
3. Run a job
4. While viewing the job, add /viewer to go to the viewer. (e.g. http://gdk.test:3000/my-group/logs-timestamps/-/jobs/1924/viewer)

This is a FF_TIMESTAMPS: "true" pipeline I use to test 👇 :

Click to expand

variables:
  FF_TIMESTAMPS: "true"
  FF_SCRIPT_SECTIONS: "true" # this will allow you to collapse arbitrary scripts in the log

stages:
  - build

simple-job:
  stage: build
  script:
    - echo 'A simple command'

styled-job:
  stage: build
  before_script:
    - TXT_RED="\033[31m" && TXT_CLEAR="\033[0m"
  script:
    - echo -e "${TXT_RED}This is a long line of text, and this text is red, and this text is red, and this text is red,${TXT_CLEAR} but this part isn't${TXT_RED} however this part is red once more in this long line."
    - echo "This text is not colored"


# A multi-line command that should be collapsible
multi-line-command-job:
  stage: build
  script:
    - |
      echo "{
        'test': 'data',
        'test2': 'data2',
      }"
    - |
      echo "{
        'test': 'data',
        'test2': 'data2',
      }"

# This jobs helps me test long running jobs with many lines that gets cancelled
# You'll have to cancel this job manually to truncate it.
long-running-job:
  stage: build
  script:
    - while sleep 1; do date; done

# A job that triggers "Showing last 500.04 KiB of log" at the top for being too long
showing-last-job:
  stage: build
  script:
    - for i in {1..500}; do echo "This is a long line that gets repeated many many many many many many many many many many many many times $i"; done
    - for i in {1..500}; do echo "This is a long line that gets repeated many many many many many many many many many many many many times $i"; done
    - for i in {1..500}; do echo "This is a long line that gets repeated many many many many many many many many many many many many times $i"; done
    - for i in {1..500}; do echo "This is a long line that gets repeated many many many many many many many many many many many many times $i"; done
    - for i in {1..500}; do echo "This is a long line that gets repeated many many many many many many many many many many many many times $i"; done
    - for i in {1..500}; do echo "This is a long line that gets repeated many many many many many many many many many many many many times $i"; done
    - for i in {1..500}; do echo "This is a long line that gets repeated many many many many many many many many many many many many times $i"; done
    - for i in {1..500}; do echo "This is a long line that gets repeated many many many many many many many many many many many many times $i"; done
    - for i in {1..500}; do echo "This is a long line that gets repeated many many many many many many many many many many many many times $i"; done
    - for i in {1..500}; do echo "This is a long line that gets repeated many many many many many many many many many many many many times $i"; done

collapsible_job_single:
  variables:
    FF_SCRIPT_SECTIONS: "false"
  stage: build
  script:
    - echo -e "\033[0Ksection_start:`date +%s`:my_first_section\r\033[0KHeader of the 1st collapsible section"
    - echo 'this line should be hidden when collapsed'
    - echo -e "\033[0Ksection_end:`date +%s`:my_first_section\r\033[0K"

collapsible_job_multiple:
  variables:
    FF_SCRIPT_SECTIONS: "false"
  stage: build
  script:
    - echo -e "\033[0Ksection_start:`date +%s`:my_first_section\r\033[0KHeader of the 1st collapsible section"
    - echo 'this line should be hidden when collapsed'
    - echo -e "\033[0Ksection_start:`date +%s`:second_section\r\033[0KHeader of the 2nd collapsible section"
    - echo 'this line should be hidden when collapsed'
    - echo -e "\033[0Ksection_end:`date +%s`:second_section\r\033[0K"
    - echo -e "\033[0Ksection_end:`date +%s`:my_first_section\r\033[0K"

Related to #465350