feat(ui5-progress-indicator): init implementation

[nnaydenow]

Fixes: #1392

[CLAassistant]

All committers have signed the CLA.

[vladitasev]

Add demokit sample.

Add the component here: packages/playground/_site/build-scripts/samples-prepare.js to get the "new" label in playground.

[ilhan007]

I think there are some several icons displayed in HCB when value state is set.

[ilhan007]

To fix the test

• create method to get the validated value

const getValidatedValue = (pi) => {
return browser.execute((pi) => {
return pi.validatedValue;
}, pi);
};

• use in the asserts

validButton.click();
assert.strictEqual(getValidatedValue(progressIndicator), 50, “The value is validated correctly.“);

sample added, new label added