editorconfig: use an indentation of 2 for json and yaml files

[GrimLink]

Summary (*)

Consider using a indentation of 2 for json and yaml files.
The recommended default for the package.json and yaml files is 2.

The only exception is composer that uses 4.

Examples (*)

None, this just a formatting suggestion

Proposed solution

See my Pr #30062

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• Severity: S0 - Affects critical data or functionality and leaves users with no workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

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[ihor-sviziev]

Priority and Severity labels were copied from #30066 that duplicates this issue