[AMBARI-23514-trunk] - Log Search UI: various fixes for History feature

[tobias-istvan]

What changes were proposed in this pull request?

1. Implement handling of case when there's nothing to undo or redo
2. Refine styles and labels for History dropdown
3. Handle case of large history dropdown items count

How was this patch tested?

Manual and unit tests (267/267 success)

Please review Ambari Contributing Guide before opening a pull request.

@aBabiichuk please review it.

[asfgit]

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Test PASSed.

[asfgit]

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Test FAILed.
Test FAILured.

[aBabiichuk]

• is it expected that Undo and Redo dropdowns aren't styles the same as History one?
• labels formatting is not changed

[asfgit]

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Test FAILed.
Test FAILured.

[aBabiichuk]

2512197 [INFO] ambari-logsearch ................................... SUCCESS [ 0.556 s] 2512197 [INFO] Ambari Logsearch Appender .......................... SUCCESS [ 0.570 s] 2512197 [INFO] Ambari Logsearch Config Api ........................ SUCCESS [ 0.977 s] 2512197 [INFO] Ambari Logsearch Config Zookeeper .................. SUCCESS [ 0.314 s] 2512197 [INFO] Ambari Logsearch Log Feeder Plugin Api ............. SUCCESS [ 0.807 s] 2512197 [INFO] Ambari Logsearch Log Feeder ........................ SUCCESS [ 17.204 s] 2512197 [INFO] Ambari Logsearch Web ............................... SUCCESS [03:33 min] 2512197 [INFO] Ambari Logsearch Server ............................ SUCCESS [ 21.215 s] 2512197 [INFO] Ambari Logsearch Assembly .......................... SUCCESS [ 0.148 s] 2512197 [INFO] Ambari Logsearch Integration Test .................. SUCCESS [ 3.310 s]