Fix Dynamic Bridge example compilation

[andy31415]

#26016 pulled in some std::string-backed global structs into the bridge app, which made it fail to compile since it was relying that operator= is defined for underlying data types and they are not (for std::string and chip::CharSpan).

I switched things to a separate Assign operation that I overloaded for std::string/char-span compatibility.
I also added dynamic bridge to CI tests so that this app does not fail again.

[github-actions]

PR #26129: Size comparison from 5cdb0a5 to e7003ad

Full report (1 build for cc32xx)

platform	target	config	section	5cdb0a5	e7003ad	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	643249	643249	0	0.0
			(read/write)	203848	203848	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197248	197248	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	933224	933224	0	0.0
			.debug_aranges	87792	87792	0	0.0
			.debug_frame	302140	302140	0	0.0
			.debug_info	20328411	20328411	0	0.0
			.debug_line	2687890	2687890	0	0.0
			.debug_loc	2838930	2838930	0	0.0
			.debug_ranges	288072	288072	0	0.0
			.debug_str	3042155	3042155	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	104401	104401	0	0.0
			.shstrtab	232	232	0	0.0
			.stab	204	204	0	0.0
			.stabstr	441	441	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	377963	377963	0	0.0
			.symtab	256976	256976	0	0.0
			.text	536728	536728	0	0.0

[github-actions]

PR #26129: Size comparison from 5cdb0a5 to d62f5ae

Decreases (1 build for qpg)

platform	target	config	section	5cdb0a5	d62f5ae	change	% change
qpg	lighting-app	qpg6105+debug	(read/write)	1166704	1166696	-8	-0.0
			.text	613804	613796	-8	-0.0

Full report (4 builds for cc32xx, mbed, qpg)

platform	target	config	section	5cdb0a5	d62f5ae	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	643249	643249	0	0.0
			(read/write)	203848	203848	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197248	197248	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	933224	933224	0	0.0
			.debug_aranges	87792	87792	0	0.0
			.debug_frame	302140	302140	0	0.0
			.debug_info	20328411	20328411	0	0.0
			.debug_line	2687890	2687890	0	0.0
			.debug_loc	2838930	2838930	0	0.0
			.debug_ranges	288072	288072	0	0.0
			.debug_str	3042155	3042155	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	104401	104401	0	0.0
			.shstrtab	232	232	0	0.0
			.stab	204	204	0	0.0
			.stabstr	441	441	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	377963	377963	0	0.0
			.symtab	256976	256976	0	0.0
			.text	536728	536728	0	0.0
mbed	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2466336	2466336	0	0.0
			.bss	215960	215960	0	0.0
			.data	5888	5888	0	0.0
			.text	1428980	1428980	0	0.0
qpg	lighting-app	qpg6105+debug	(read/write)	1166704	1166696	-8	-0.0
			.bss	99308	99308	0	0.0
			.data	856	856	0	0.0
			.text	613804	613796	-8	-0.0
	lock-app	qpg6105+debug	(read/write)	1136776	1136776	0	0.0
			.bss	94452	94452	0	0.0
			.data	860	860	0	0.0
			.text	583872	583872	0	0.0