[neurun] Implemented scheduler test with branched graph (#6926)

[neurun] Implemented scheduler test with branched graph (#6926)

* [neurun] Implemented scheduler test with branched graph

* Implemented scheduler test with branched graph and known execution time
* Added set time methods to ExecTime
* Refactored existing scheduler test a little bit

Signed-off-by: Ivan Vagin <ivan.vagin@samsung.com>
* 'set' methods from ExecutionTime replaced with helper functions

Signed-off-by: Ivan Vagin <ivan.vagin@samsung.com>
* remove profile data before test

Signed-off-by: Ivan Vagin <ivan.vagin@samsung.com>
* Review fixes

Signed-off-by: Ivan Vagin <ivan.vagin@samsung.com>
* Increased execution time for GPU in last test

Signed-off-by: Ivan Vagin <ivan.vagin@samsung.com>
* Set correct large exec time for gpu

Signed-off-by: Poshshoev Dilshodzhon <d.poshshoev@samsung.com>