refactor(camel-plugin): polish the look and feel

[mmelko]

• Set the default background to the white color
• Set trees height to whole page
• Replace Cards with Panels across camel-plugin components and also in Attributes and Operation shared components

Some images after the change:

[github-actions[bot]]

Test Results

  8 files  ±0    8 suites  ±0   50m 24s :stopwatch: -10s  66 tests ±0   64 :white_check_mark: ±0   2 :zzz: ±0  0 :x: ±0  536 runs  ±0  508 :white_check_mark: ±0  28 :zzz: ±0  0 :x: ±0 

Results for commit dae41fd7. ± Comparison against base commit 4c1e92c8.

[hawtio-ci[bot]]

Test results

Run attempt: 1509 Detailed summary	NAME	TESTS	PASSED ✅	SKIPPED 💤	FAILED ❌	ERRORS 🚫	TIME 🕖
results-quarkus-node(18)-java(17)-firefox	67	64	3	0	0	373.716
results-quarkus-node(18)-java(21)-firefox	67	64	3	0	0	373.551
results-quarkus-node(20)-java(17)-firefox	67	64	3	0	0	374.672
results-quarkus-node(20)-java(21)-firefox	67	64	3	0	0	376.184
results-springboot-node(18)-java(17)-firefox	67	63	4	0	0	372.364
results-springboot-node(18)-java(21)-firefox	67	63	4	0	0	387.697
results-springboot-node(20)-java(17)-firefox	67	63	4	0	0	378.875
results-springboot-node(20)-java(21)-firefox	67	63	4	0	0	387.919