Rename parameters from ScalarDB to ScalarDb

[inv-jishnu]

Description

I have renamed all variable names starting with ScalarDB to ScalarDb based on feedback from Suzuki-san

Related issues and/or PRs

This PR should be reviewed and merged after the following PR is merged.
#2462

Changes made

I have updated variable names ScalarDB to ScalarDb such as ScalarDbDao, ScalaDbMode

Checklist

The following is a best-effort checklist. If any items in this checklist are not applicable to this PR or are dependent on other, unmerged PRs, please still mark the checkboxes after you have read and understood each item.

• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation to reflect the changes.
• I have considered whether similar issues could occur in other products, components, or modules if this PR is for bug fixes.
• Any remaining open issues linked to this PR are documented and up-to-date (Jira, GitHub, etc.).
• Tests (unit, integration, etc.) have been added for the changes.
• My changes generate no new warnings.
• Any dependent changes in other PRs have been merged and published.

Additional notes (optional)

NA

Release notes

NA