Add tabindex to all grid row elements(with/without tabs) which has only plain text to make it tabable.

[psoujany]

This PR fixes the accessibility violations seen with achecker tool.

Message: The scrollable element <div> with non-interactive content is not tabbable
 Level: violation
 XPath: /html[1]/body[1]/div[1]/main[1]/div[2]/div[2]/div[1]/div[3122]
 Snippet: <div class="col-last odd-row-color all-classes-table all-classes-table-tab2">
 Help: https://able.ibm.com/rules/archives/latest/doc/en-US/element_scrollable_tabbable.html#%7B%22message%22%3A%22The%20scrollable%20element%20%3Cdiv%3E%20with%20non-interactive%20content%20is%20not%20tabbable%22%2C%22snippet%22%3A%22%3Cdiv%20class%3D%5C%22col-last%20odd-row-color%20all-classes-table%20all-classes-table-tab2%5C%22%3E%22%2C%22value%22%3A%5B%22VIOLATION%22%2C%22FAIL%22%5D%2C%22reasonId%22%3A%22fail_scrollable%22%2C%22ruleId%22%3A%22element_scrollable_tabbable%22%7D

[psoujany]

@pshipton As per your suggestion here ibmruntimes/openj9-openjdk-jdk17#472, raising this PR. Thank you.

[psoujany]

Once the PR is merged, will backport the changes to 24/21/17 repos. Thank you.

[psoujany]

Personal build is successful with the changes and violation(The scrollable element

with non-interactive content is not tabbable) is not seen with the changes in accessibility testing.

@smoinud1 FYI

[keithc-ca]

Please avoid "tababble" - if it's a word, it would end with "able" (just one "b", not two).

[keithc-ca]

These lines are redundant; see lines 338-341.

[psoujany]

Yes Keith, here we have 2 styles.

1. rowStyle without tabs : cell.addStyle(rowStyle); creates div as <div class="col-first even-row-color">
2. rowStyle with tabs : cell.addStyle(tabClass); creates div as <div class="col-last odd-row-color all-classes-table all-classes-table-tab2">

For both the styles tab should get focus, to do that we need to add role=tablist tabindex=0.

[keithc-ca]

This seems to apply to many more places than the title suggests - I don't think this is what we want.

[psoujany]

These values should be applied to all grid rows with/without tab elements which has only plain text.