[wrangler] Allow empty strings in secret:bulk

[Sibirius]

What this PR solves / how to test:
Previously when running secret:bulk with a secret.json containing a variable with an empty string as value the bulk operation would fail. This was due to the check for a falsy value when merging instead of comparing to undefined to make sure all specified values are excluded. The old other check would keep both the current value and the new value in the merged list which would then be rejected by the settings API as it doesn't allow the same key to be present multiple times.

Author has addressed the following:

• Tests
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• Changeset (Changeset guidelines)
  • Included
  • Not necessary because:
• Associated docs
  • Issue(s)/PR(s):
  • Not necessary because: just a small fix

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[changeset-bot]

🦋 Changeset detected

Latest commit: ac9b5d0

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
wrangler	Patch

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[github-actions]

A wrangler prerelease is available for testing. You can install this latest build in your project with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/7699491551/npm-package-wrangler-4860

You can reference the automatically updated head of this PR with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/4860/npm-package-wrangler-4860

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/7699491551/npm-package-wrangler-4860 dev path/to/script.js

Additional artifacts:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/7699491551/npm-package-create-cloudflare-4860 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/7699491551/npm-package-miniflare-4860

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/7699491551/npm-package-cloudflare-pages-shared-4860

Note that these links will no longer work once the GitHub Actions artifact expires.

---

[email protected] includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20231218.4
workerd	1.20231218.0	1.20231218.0
workerd --version	1.20231218.0	2023-12-18

Please ensure constraints are pinned, and miniflare/workerd minor versions match.

[mrbbot]

Looks good! Thanks for fixing that. 🙂

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fbd2a4c) 70.70% compared to head (ac9b5d0) 70.72%.
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4860      +/-   ##
==========================================
+ Coverage   70.70%   70.72%   +0.02%     
==========================================
  Files         291      291              
  Lines       15164    15165       +1     
  Branches     3859     3859              
==========================================
+ Hits        10721    10725       +4     
+ Misses       4443     4440       -3     

Files	Coverage Δ
packages/wrangler/src/secret/index.ts	83.33% <100.00%> (+0.09%)	⬆️

... and 5 files with indirect coverage changes