Add the rspec_section function

Context

Closes #434850 (closed)

What does this MR do and why?

• Makes the section_start collapsed parameter configurable:

# Before
section_start "my-section-tag" "My section"

# After
section_start "my-section-tag" "My section" # collapsed by default
section_start "my-section-tag" "My section" "false" # uncollapsed

• Adds the rspec_section shell function:

# Before
section_start "rspec" "RSpec" "false"
bin/rspec
section_end "rspec"

# After
rspec_section bin/rspec

Test it locally

docker run -it ruby:3.1-alpine3.16 sh

function rspec_section() {
  echo "$@"
  "$@"
}

function rspec_parallelized_job() {
  echo "First param: ${1}"
  echo "Second param: ${2}"
}

export RSPEC_FAIL_FAST_THRESHOLD=30

$ rspec_section rspec_parallelized_job "--fail-fast=${RSPEC_FAIL_FAST_THRESHOLD}" "--tag ~quarantine --tag ~level:background_migration --tag ~click_house --tag ~real_ai_request"
rspec_parallelized_job --fail-fast=30 --tag ~quarantine --tag ~level:background_migration --tag ~click_house --tag ~real_ai_request
First param: --fail-fast=30
Second param: --tag ~quarantine --tag ~level:background_migration --tag ~click_house --tag ~real_ai_request

MR acceptance checklist

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