WW-5516 Fix TemplateDir and Theme fallback to Request/Session/Application attributes

[kusalk]

WW-5516

This is a fix for a functionality regression introduced in #763. Instead of re-introducing the dependency on an OGNL context expression, we instead access the required attributes directly through Java instead. This fixes the regression whilst still allowing applications to block OGNL context access (expressions beginning with #) using OgnlGuard if they desire.

[lukaszlenart]

Looks good, I would just add one more test without using OGNL expression, just set value in a given scope (application or session) and check if it was resolved.

[sonarqubecloud]

Quality Gate failed

Failed conditions
22 Security Hotspots
42.3% Coverage on New Code (required ≥ 80%)
3.4% Duplication on New Code (required ≤ 3%)
E Security Rating on New Code (required ≥ A)
E Reliability Rating on New Code (required ≥ A)

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