fix: handle edge case when formatting reporter titles

[clample]

I hereby confirm that I followed the code guidelines found at engineering guidelines

Affected Components

• CLI
• Create CLI
• Test
• Docs
• Examples
• Other

Notes for the Reviewer

Resolves after release #697

The linked issue reports checkly trigger causing an out of bounds error. This appears to happen in a CI environment:

RangeError: Invalid count value: -4
    at String.repeat (<anonymous>)
    at formatSectionTitle (/home/circleci/.npm/_npx/a66ee913fe899ce0/node_modules/checkly/src/reporters/util.ts:234:39)
...

This is caused by the terminal width being 0 in some CI environments (aws/aws-cdk#2253).

When we format the section title, we then get a negative number and cause this out of bounds error:

checkly-cli/packages/cli/src/reporters/util.ts

Line 234 in e1b75b6

return `──${chalk.bold(title)}${'─'.repeat(width - title.length)}`

To fix the issue, this PR uses Math.max(..., 0) to ensure that the padding length is always non-negative. When working on the PR, I also noticed that the formula doesn't take the indentation and extra left-side -- into account when calculating the right padding. This causes always 6 characters of wrap-around in the title (see first screenshot below). This PR also updates the calculation for the right padding to take this into account and avoid the wraparound (see second screenshot below).

Before PR:

After PR:

[nahuelon]

LGTM