Explicitly add chokidar, readdirp and yaml as dev dependencies to solve dependabot issues

[tdonohue]

Description

Recently, in every PR it creates, dependabot will attempt to remove the chokidar, readdirp and yaml dependencies from our package-lock.json file because they are not explicitly used in dspace-angular (as they are transitive dependencies).

However, removing these dependencies causes immediate errors in npm install because all three dependences are required by Angular (and a few other direct dependencies).

Examples of dependabot PRs which attempt to remove these dependencies include the following:

• build(deps): bump browserslist from 4.28.1 to 4.28.9 #6185
• build(deps): bump uuid from 14.0.1 to 14.0.2 #6150
• build(deps): bump the angular group across 1 directory with 13 updates #6152
  (This currently occurs on almost EVERY dependabot PR against the main, dspace-10_x and dspace-9_x branches)

This PR attempts to resolve the issue by adding all three as development dependencies, which should make it clear to dependabot they are needed.

# The versions here correspond to the versions that are currently listed in our `package-lock.json` file.
npm install --save-dev chokidar@^4.0.3
npm install --save-dev readdirp@^4.1.2
npm install --save-dev yaml@^2.9.0

NOTE: Because this impacts several branches, this PR will need to be ported to dspace-10_x and dspace-9_x. It's likely it will need to be recreated on each branch using the above commands as these branches do not have identical dependencies. It does NOT need to be ported to 8.x because that uses yarn, and this dependabot issue seems to be specific to npm.

NOTE 2: After this PR is merged, every dependabot PR against main will need to be recreated via @dependabot recreate. That should tell dependabot to use the updated packaging settings & hopefully resolve the issues.

Instructions for Reviewers

• Verify no change in behavior to the npm install process as well as the build (e.g. npm run build:prod) or running of the UI (e.g. npm run serve:ssr).
  • I've tested all these commands locally and found no differences in behavior.

[tdonohue]

@alanorth : Pinging you on this because I think this should finally fix the dependabot issues we've been seeing. This PR is not ideal because it adds these transitive dependencies as dev dependencies, but the output of the PR is very promising. If you look closely it makes similar changes to package-lock.json which dependabot keeps trying to do...but then it also moves these dependencies to explicit dev dependencies.

Thoughts welcome. As I noted above, if we find this works for main, I think we'd need to build similar PRs for 10.x and 9.x. I'm not confident that this PR would port cleanly in an automated fashion...we may have to run the commands (see description) on each branch individually and create a new PR for each.