feat(Datagrid): add opt out ability for editable cells

[matthewgallo]

Closes #5379

Currently there is no way to opt out of inline editing at the cell level. You can disable editing for an entire column in the table but it isn't possible to have one or more non editable cells in a column with other editable cells. This PR adds that behavior, I added a note in the EditableCell story about which cell is non editable for demonstration purposes.

Example story can be viewed here.

I also found a bug within editable cell Datagrids where if you attempt to go into edit mode (Enter key) from a non-editable cell, the inline edit context's reducer updates the state to be in edit mode. This prevents you from actually going into edit mode within an editable cell because the context thinks we're already in edit mode. I've included this fix here as well since it was a very small change.

What did you change?

packages/ibm-products/src/components/Datagrid/Datagrid/addons/InlineEdit/InlineEditCell/InlineEditCell.js
packages/ibm-products/src/components/Datagrid/Extensions/EditableCell/EditableCell.docs-page.js
packages/ibm-products/src/components/Datagrid/Extensions/EditableCell/EditableCell.stories.jsx
packages/ibm-products/src/components/Datagrid/useInlineEdit.js
packages/ibm-products/src/components/Datagrid/utils/makeData.js

How did you test and verify your work?

Storybook

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[AustinGitHub]

I checked out the changes on my local env and this works, thank you!

[emyarod]

looks good to me!

[emyarod]

looks good to me!

[kennylam]

LGTM!