Update workflows to use centralised secrets management references

[sukeshreddyg]

A reference to the issue / Description of it

This PR updates the schedule-baseline workflow to reference the centralised secrets management system instead of the previously used repository-specific reusable workflows and actions. #7109

How does this PR fix the problem?

It fixes the issue by centralizing secrets management, ensuring consistency and easier maintenance across workflows.

How has this been tested?

Please describe the tests that you ran and provide instructions to reproduce.

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Deployment Plan / Instructions

Will this deployment impact the platform and / or services on it?

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Checklist (check x in [ ] of list items)

• I have performed a self-review of my own code
• All checks have passed
• I have made corresponding changes to the documentation
• Plan and discussed how it should be deployed to PROD (If needed)

Additional comments (if any)

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[github-actions]

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</details> #### `Checkov Scan` Success
<details><summary>Show Output</summary>

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Checkov will check the following folders:

CTFLint Scan Success

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Setting default tflint config...
Running tflint --init...
Installing "terraform" plugin...
Installed "terraform" (source: github.com/terraform-linters/tflint-ruleset-terraform, version: 0.9.1)
tflint will check the following folders:

Trivy Scan Success

Show Output

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Trivy will check the following folders:

[github-actions]

Trivy Scan Success

Show Output

```hcl

---

Trivy will check the following folders:

</details> #### `Checkov Scan` Success
<details><summary>Show Output</summary>

```hcl

*****************************

Checkov will check the following folders:

CTFLint Scan Success

Show Output

*****************************

Setting default tflint config...
Running tflint --init...
Installing "terraform" plugin...
Installed "terraform" (source: github.com/terraform-linters/tflint-ruleset-terraform, version: 0.9.1)
tflint will check the following folders:

Trivy Scan Success

Show Output

*****************************

Trivy will check the following folders: