chore: update actions to npm8

[dreamorosi]

Description of your changes

This PR introduces changes in the workflows ran on GitHub Actions so that they make use of [email protected] which we introduced as recommended version for the project in #492. This means that:

• We don't need to run npm i in the packages/* folders (which makes redundant the npm run lerna-ci step)
• We don't need a package-lock.json in each one of them as they are managed in the one at the root of the project

How to verify this change

See this test run that I made on a fork of this repo, it uses the changes in this PR and also the ones in the #569 one: https://github.com/dreamorosi/aws-lambda-powertools-typescript/runs/5289484522?check_suite_focus=true

Related issues, RFCs

#569

PR status

Is this ready for review?: YES
Is it a breaking change?: NO

Checklist

• My changes meet the tenets criteria
• I have performed a self-review of my own code
• I have commented my code where necessary, particularly in areas that should be flagged with a TODO, or hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding changes to the examples
• My changes generate no new warnings
• The code coverage hasn't decreased
• New and existing unit tests pass locally and in Github Actions
• The PR title follows the conventional commit semantics

Breaking change checklist

N/A

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[dreamorosi]

Just for context, the pr-lint-and-test check is failing here because not all dependencies have been pulled up in the root's package-lock.json and so [email protected] (now being used) thinks the package.json files & the lock are out of sync, this is addressed in #569.

I broke down the changes in 2 PRs to keep each one focused and independent as agreed, if you want to see both changes in one PR you can check this PR on a fork that includes both #569 & this PR.

[ijemmy]

One point in the doc.

[dreamorosi]

One point in the doc.

Good catch, committed!