refactor(ui5-list, ui5-tree, ui5-upload-collection): rename mode to selectionMode

[yanaminkova]

Renames the mode property of ui5-list, ui5-tree and ui5-upload-collection to selectionMode.
Also renames the ListMode enum to ListSelectionMode and its values as it follows:
SingleSelect is renamed to Single
MultiSelect is renamed to Multiple
SingleSelectBegin is renamed to SingleStart
SingleSelectEnd is renamed to SingleEnd
SingleSelectAuto is renamed to SingleAuto

BREAKING CHANGE: The mode property and the ListMode enum have been renamed.
If you have previously used the mode property and the ListMode values:

<ui5-list class="list" mode="SingleSelect">
<ui5-list class="list" mode="MultiSelect">
<ui5-upload-collection mode="SingleSelectBegin">
<ui5-upload-collection mode="SingleSelectEnd">
<ui5-tree mode="SingleSelectAuto" >
<ui5-tree mode="None" >

Now use selectionMode and Single, Multiple instead:

<ui5-list class="list" selection-mode="Single">
<ui5-list class="list" selection-mode="Multiple">
<ui5-upload-collection selection-mode="SingleStart">
<ui5-upload-collection selection-mode="SingleEnd">
<ui5-tree selection-mode="SingleAuto">
<ui5-tree selection-mode="None">

Related to #8461, #7887